2301A7 | Class x Plug Gauge

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1,022 Products

Class Z Plug Gauges

Also known as pin gauges, these Class Z plug gauges help you measure hole size and depth, check hole location and distance, and set micrometers. All come with a certificate of accuracy traceable to NIST that states they've passed a test for accuracy.

If a go gauge can enter the hole and a no-go gauge is unable to enter, the hole is within tolerance.

Go Gauges—Go gauges check the minimum hole diameter.

No-Go Gauges—No-go gauges check the maximum hole diameter.

							Go Gauges			No-Go Gauges
	Choose a Plug Gauge Size	Lg.	Surface Smoothness, RMS, μin	Hardness	Material	Specs. Met	Plug Gauge Size Tolerance		Each	Plug Gauge Size Tolerance		Each
Class Z Gauge



		0.0110" to 0.0605"	2"	8	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.0001"	23055A001	00000	-0.0001" to 0"	23065A503	00000


		0.0610" to 0.2405"	2"	8	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.0001"	23055A97	0000	—	———	0
		0.0610" to 0.2500"	2"	8	Rockwell C60	Tool Steel	ASME B89.1.5	—	———	0	-0.0001" to 0"	23065A674	0000
		0.2410" to 0.5005"	2"	8	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.0001"	23055A99	0000	—	———	0
		0.2505" to 0.5005"	2"	8	Rockwell C60	Tool Steel	ASME B89.1.5	—	———	0	-0.0001" to 0"	23065A855	0000
		0.5010" to 0.6255"	2"	8	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.0001"	23055A004	0000	-0.0001" to 0"	23065A506	0000
		0.6260" to 0.7505"	2"	8	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.0001"	23055A005	00000	-0.0001" to 0"	23065A507	00000
		0.7510" to 0.8325"	2"	8	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.0001"	23055A006	00000	-0.0001" to 0"	23065A508	00000
		0.8330" to 0.9165"	2"	8	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.0001"	23055A007	00000	-0.0001" to 0"	23065A509	00000
		0.9170" to 1.0005"	2"	8	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.0001"	23055A008	00000	-0.0001" to 0"	23065A511	00000
		0.2200 mm to 1.5100 mm	2"	8	Rockwell C60	Tool Steel	ASME B89.1.5	0 mm to 0.00254 mm	2281A1	0000	-0.00254 mm to 0 mm	2281A9	00000


		1.5200 mm to 12.7100 mm	2"	8	Rockwell C60	Tool Steel	ASME B89.1.5	0 mm to 0.00254 mm	2281A2	0000	-0.00254 mm to 0 mm	2281A11	0000
		12.7200 mm to 15.3100 mm	2"	8	Rockwell C60	Tool Steel	ASME B89.1.5	0 mm to 0.00254 mm	2281A3	0000	-0.00254 mm to 0 mm	2281A12	0000
		15.3200 mm to 17.8100 mm	2"	8	Rockwell C60	Tool Steel	ASME B89.1.5	0 mm to 0.00254 mm	2281A4	00000	-0.00254 mm to 0 mm	2281A13	00000
		17.8200 mm to 20.3700 mm	2"	8	Rockwell C60	Tool Steel	ASME B89.1.5	0 mm to 0.00254 mm	2281A5	00000	-0.00254 mm to 0 mm	2281A14	00000
		20.3800 mm to 22.0500 mm	2"	8	Rockwell C60	Tool Steel	ASME B89.1.5	0 mm to 0.00305 mm	2281A6	00000	-0.00305 mm to 0 mm	2281A15	00000
		22.0600 mm to 23.7300 mm	2"	8	Rockwell C60	Tool Steel	ASME B89.1.5	0 mm to 0.00305 mm	2281A7	00000	-0.00305 mm to 0 mm	2281A16	00000
		23.7400 mm to 25.4100 mm	2"	8	Rockwell C60	Tool Steel	ASME B89.1.5	0 mm to 0.00305 mm	2281A8	00000	-0.00305 mm to 0 mm	2281A17	00000

Class X Plug Gauges

Also known as pin gauges, these Class X plug gauges are used for precision go/no-go measuring of hole sizes and depths, checking hole location and distance, and setting micrometers. All come with an accuracy certificate traceable to NIST that states they've passed a test for accuracy.

If a go gauge can enter the hole and a no-go gauge is unable to enter, the hole is within tolerance.

Go Gauges—Go gauges check the minimum hole diameter.

No-Go Gauges—No-go gauges check the maximum hole diameter.

							Go Gauges			No-Go Gauges
	Choose a Plug Gauge Size	Lg.	Surface Smoothness, RMS, μin	Hardness	Material	Specs. Met	Plug Gauge Size Tolerance		Each	Plug Gauge Size Tolerance		Each
Class X Gauge



		0.0040" to 0.0150"	2"	4	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	21135A71	000000	-0.00004" to 0"	21135A81	000000


		0.0151" to 0.0300"	2"	4	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	21135A32	00000	-0.00004" to 0"	21135A52	00000
		0.0301" to 0.0750"	2"	4	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	21135A33	00000	-0.00004" to 0"	21135A53	00000
		0.0751" to 0.1800"	2"	4	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	21135A34	00000	-0.00004" to 0"	21135A54	00000
		0.1801" to 0.2810"	2"	4	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	21135A35	00000	-0.00004" to 0"	21135A55	00000
		0.2811" to 0.4060"	2"	4	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	21135A36	00000	-0.00004" to 0"	21135A56	00000
		0.4061" to 0.5100"	2"	4	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	21135A37	00000	-0.00004" to 0"	21135A57	00000
		0.5101" to 0.6350"	2"	4	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	21135A38	00000	-0.00004" to 0"	21135A58	00000
		0.6351" to 0.7600"	2"	4	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	21135A39	00000	-0.00004" to 0"	21135A59	00000
		0.7601" to 1.0100"	2"	4	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00006"	21135A41	00000	-0.00006" to 0"	21135A61	00000
		0.101 mm to 0.381 mm	2"	4	Rockwell C60	Tool Steel	ASME B89.1.5	0 mm to 0.001 mm	2301A1	00000	-0.001 mm to 0 mm	2301A8	00000


		0.382 mm to 0.762 mm	2"	4	Rockwell C60	Tool Steel	ASME B89.1.5	0 mm to 0.001 mm	2301A2	00000	-0.001 mm to 0 mm	2301A9	00000
		0.763 mm to 1.905 mm	2"	4	Rockwell C60	Tool Steel	ASME B89.1.5	0 mm to 0.001 mm	2301A3	00000	-0.001 mm to 0 mm	2301A11	00000
		1.906 mm to 4.572 mm	2"	4	Rockwell C60	Tool Steel	ASME B89.1.5	0 mm to 0.001 mm	2301A4	00000	-0.001 mm to 0 mm	2301A12	00000
		4.573 mm to 7.137 mm	2"	4	Rockwell C60	Tool Steel	ASME B89.1.5	0 mm to 0.001 mm	2301A16	00000	-0.001 mm to 0 mm	2301A17	00000
		7.138 mm to 10.312 mm	2"	4	Rockwell C60	Tool Steel	ASME B89.1.5	0 mm to 0.001 mm	2301A18	00000	-0.001 mm to 0 mm	2301A19	00000
		10.313 mm to 12.954 mm	2"	4	Rockwell C60	Tool Steel	ASME B89.1.5	0 mm to 0.001 mm	2301A21	00000	-0.001 mm to 0 mm	2301A22	00000
		12.955 mm to 16.129 mm	2"	4	Rockwell C60	Tool Steel	ASME B89.1.5	0 mm to 0.001 mm	2301A5	00000	-0.001 mm to 0 mm	2301A13	00000
		16.130 mm to 19.304 mm	2"	4	Rockwell C60	Tool Steel	ASME B89.1.5	0 mm to 0.001 mm	2301A6	00000	-0.001 mm to 0 mm	2301A14	00000
		19.305 mm to 25.654 mm	2"	4	Rockwell C60	Tool Steel	ASME B89.1.5	0 mm to 0.0015 mm	2301A7	00000	-0.0015 mm to 0 mm	2301A15	00000
		Class x Plug Gauge, Tool Steel, Go Gauge, 19.305 mm to 25.654 mm Sizes Product Detail Choose a Plug Gauge Size between 19.305 mm and 25.654 mm in 0.001 mm increments. 19.305 19.306 19.307 19.308 19.309 19.310 19.311 19.312 19.313 19.314 19.315 19.316 19.317 19.318 19.319 QuantityEachShips in 7-8 weeks Select a compatible file type: Parasolid

Go/No-Go Threaded Plug Gauges with Handle

Speed up thread tolerance checks—the handle on these gauges gives you a good grip to quickly thread and unthread go or no-go gauges. Use these gauges to make sure nuts, tapped holes, and other parts fall within tolerance. All are precisely manufactured to confirm thread fit. If the plug gauges wear down, you can insert new ones (not included) onto the taperlock handle.

A part is within tolerance if it’s easy to thread the go gauge into the part but difficult to thread the no-go gauge more than two turns.

Go/no-go gauges have both a go gauge on one end of the handle and a no-go gauge on the other to speed up tests. Go gauges check the minimum internal thread size. No-go gauges check the maximum internal thread size.

Class X Gauge

Double-Ended Taperlock

Handle

Accuracy Certificate Traceable to NIST—Gauges with an accuracy certificate traceable to NIST include verification from the manufacturer that their thread sizes are within tolerance. The certificate is also known as a certificate of compliance or a short-form certification.

Calibration Certificate Traceable to NIST—Gauges with a calibration certificate traceable to NIST were calibrated in a lab. The certificate, sometimes called a test report or long-form certificate, details the tested measurements.

For Class 2B Unified Standard Thread Fit—For inch threads, the higher the class number, the tighter the fit. Unified Standard Class 2B is standard and works for most applications.

For Metric Class 6H Thread Fit—These metric-threaded gauges are class 6H, which is comparable to the fit of those with Class 2B Unified Standard.

For Thread Fit—Thread fit designates the tightness or looseness of mating threads.

	Thread Size	Thread Type	Pitch Dia. Tolerance	Hardness	Material	Features	Choose a Thread Fit		Each
Go/No-Go Gauges



		0-80	UNF	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A501	0000000


		1-72	UNF	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A503	000000
		2-56	UNC	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A504	000000
		3-48	UNC	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A506	000000
		4-40	UNC	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A508	000000
		4-48	UNF	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A509	000000
		5-40	UNC	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A511	000000
		6-32	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A513	000000
		6-40	UNF	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A514	000000
		8-32	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A515	000000
		8-36	UNF	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A516	000000


		10-24	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A517	000000
		10-32	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A518	000000
		12-24	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A519	000000
		1/4"-20	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A522	00000
		1/4"-28	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A523	00000
		5/16"-18	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A524	00000
		5/16"-24	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A525	00000
		3/8"-16	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A526	00000
		3/8"-24	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A527	00000
		7/16"-14	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A528	00000


		7/16"-20	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A529	00000
		1/2"-13	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A531	000000
		1/2"-20	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A532	000000
		9/16"-18	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A153	000000
		5/8"-11	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A533	000000
		5/8"-18	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A534	000000
		3/4"-10	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A535	000000
		3/4"-16	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A536	000000
		7/8"-9	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A537	000000
		7/8"-14	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A538	000000


		1"-8	UNC	-0.0004" to 0.0004"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A539	000000
		1"-12	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A541	000000
		1 1/8"-12	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A544	000000
		1 1/4"-7	UNC	-0.0004" to 0.0004"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A545	000000
		1 1/4"-12	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A546	000000
		M1.6 × 0.35 mm	Metric	-0.005 mm to 0.005 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A103	000000
		M2 × 0.4 mm	Metric	-0.005 mm to 0.005 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A107	000000
		M2.5 × 0.45 mm	Metric	-0.005 mm to 0.005 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A109	000000
		M3 × 0.5 mm	Metric	-0.005 mm to 0.005 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A111	000000
		M3.5 × 0.6 mm	Metric	-0.005 mm to 0.005 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A113	000000


		M4 × 0.7 mm	Metric	-0.005 mm to 0.005 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A115	000000
		M5 × 0.8 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A119	000000
		M6 × 1 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A121	000000
		M8 × 1 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A129	000000
		M8 × 1.25 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A127	000000
		M10 × 1.25 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A133	000000
		M10 × 1.5 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A131	000000
		M12 × 1 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A141	000000
		M12 × 1.25 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A139	000000
		M12 × 1.5 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A137	000000

M12 × 1.75 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A135	000000
M14 × 1.5 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A143	000000
M16 × 1.5 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A145	000000
M16 × 2 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A147	000000
M18 × 1.5 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A149	000000

Go/No-Go Gauges with Accuracy Certificate Traceable to NIST



		1-64	UNC	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	2366A225	000000


		2-64	UNF	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A301	000000
		3-56	UNF	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A304	000000
		5-44	UNF	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A305	000000
		12-28	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A302	000000
		12-32	UNEF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A306	000000
		1/4"-32	UNEF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A307	000000
		5/16"-32	UNEF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A308	000000
		3/8"-32	UNEF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A309	000000
		7/16"-28	UNEF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A311	000000
		1/2"-28	UNEF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A312	000000


		9/16"-12	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	2366A228	000000
		9/16"-24	UNEF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A313	000000
		5/8"-24	UNEF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A314	000000
		11/16"-24	UNEF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A315	000000
		3/4"-20	UNEF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A316	000000
		7/8"-20	UNEF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A317	000000
		1"-14	UNS	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A318	000000
		1"-20	UNEF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A319	000000
		1 1/8"-7	UNC	-0.0004" to 0.0004"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	2366A229	000000
		1 3/8"-6	UNC	-0.0004" to 0.0004"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	2366A231	000000


		1 3/8"-12	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A321	000000
		1 1/2"-6	UNC	-0.0004" to 0.0004"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	2366A227	000000
		1 1/2"-12	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	2366A303	000000
		M2.2 × 0.45 mm	Metric	-0.005 mm to 0.005 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A212	000000
		M4.5 × 0.75 mm	Metric	-0.005 mm to 0.005 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A213	000000
		M5 × 0.5 mm	Metric	-0.005 mm to 0.005 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A214	000000
		M6 × 0.75 mm	Metric	-0.005 mm to 0.005 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A215	000000
		M7 × 1 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A211	000000
		M8 × 0.75 mm	Metric	-0.005 mm to 0.005 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A216	000000
		M9 × 1 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A218	000000


		M9 × 1.25 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A217	000000
		M10 × 1 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A219	000000
		M11 × 1 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A221	000000
		M11 × 1.5 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A222	000000
		M14 × 1 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A225	000000
		M14 × 1.25 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A224	000000
		M14 × 2 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A223	000000
		M16 × 1 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A226	000000
		M18 × 1 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A228	000000
		M18 × 2.5 mm	Metric	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A227	000000


		M20 × 1 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A232	000000
		M20 × 1.5 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A231	000000
		M20 × 2.5 mm	Metric	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A229	000000
		M22 × 1.5 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A234	000000
		M22 × 2.5 mm	Metric	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A233	000000
		M24 × 1.5 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A236	000000
		M24 × 2 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A237	000000
		M24 × 3 mm	Metric	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A235	000000
		M26 × 1.5 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A238	000000
		M27 × 2 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A239	000000

M27 × 3 mm	Metric	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A241	000000
M30 × 1.5 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A242	000000
M30 × 2 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A244	000000
M30 × 3.5 mm	Metric	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A243	000000
M33 × 2 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A245	000000
M33 × 3.5 mm	Metric	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A246	000000
M35 × 1.5 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A247	000000
M36 × 1.5 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A248	000000
M36 × 2 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A249	000000
M36 × 4 mm	Metric	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A251	000000

Go/No-Go Gauges with Calibration Certificate Traceable to NIST



		0-80	UNF	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A11	000000


		1-64	UNC	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A12	000000
		1-72	UNF	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A13	000000
		2-56	UNC	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A14	000000
		2-64	UNF	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A15	000000
		3-48	UNC	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A16	000000
		3-56	UNF	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A61	000000
		4-40	UNC	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A17	000000
		4-48	UNF	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A18	000000
		5-40	UNC	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A19	000000
		5-44	UNF	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A62	000000


		6-32	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A21	000000
		6-40	UNF	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A22	000000
		8-32	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A23	000000
		8-36	UNF	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A24	000000
		10-24	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A25	000000
		10-32	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A26	000000
		12-24	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A27	000000
		12-28	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A28	000000
		12-32	UNEF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A63	000000
		1/4"-20	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A29	000000


		1/4"-28	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A31	000000
		1/4"-32	UNEF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A64	000000
		5/16"-18	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A32	000000
		5/16"-24	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A33	000000
		5/16"-32	UNEF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A65	000000
		3/8"-16	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A34	000000
		3/8"-24	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A35	000000
		3/8"-32	UNEF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A66	000000
		7/16"-14	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A36	000000
		7/16"-20	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A37	000000


		7/16"-28	UNEF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A67	000000
		1/2"-13	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A38	000000
		1/2"-20	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A39	000000
		1/2"-28	UNEF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A68	000000
		9/16"-12	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	3157A336	000000
		9/16"-18	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A41	000000
		9/16"-24	UNEF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A69	000000
		5/8"-11	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A42	000000
		5/8"-18	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A43	000000
		5/8"-24	UNEF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A71	000000


		11/16"-24	UNEF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A72	000000
		3/4"-10	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A44	000000
		3/4"-16	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A45	000000
		3/4"-20	UNEF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A73	000000
		7/8"-9	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A46	000000
		7/8"-14	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A47	000000
		7/8"-20	UNEF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A74	000000
		1"-8	UNC	-0.0004" to 0.0004"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A48	000000
		1"-12	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A49	000000
		1"-14	UNS	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A75	000000

1"-20	UNEF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A76	000000
1 1/8"-7	UNC	-0.0004" to 0.0004"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	3157A337	000000
1 1/8"-12	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A51	000000
1 1/4"-7	UNC	-0.0004" to 0.0004"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A52	000000
1 1/4"-12	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A53	000000
1 3/8"-6	UNC	-0.0004" to 0.0004"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	3157A338	000000
1 3/8"-12	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A77	000000
1 1/2"-6	UNC	-0.0004" to 0.0004"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A54	000000
1 1/2"-12	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	3157A55	000000
M1.6 × 0.35 mm	Metric	-0.005 mm to 0.005 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A111	000000
M2 × 0.4 mm	Metric	-0.005 mm to 0.005 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A113	000000
M2.2 × 0.45 mm	Metric	-0.005 mm to 0.005 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A201	000000
M2.5 × 0.45 mm	Metric	-0.005 mm to 0.005 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A114	000000
M3 × 0.5 mm	Metric	-0.005 mm to 0.005 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A115	000000
M3.5 × 0.6 mm	Metric	-0.005 mm to 0.005 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A116	000000
M4 × 0.7 mm	Metric	-0.005 mm to 0.005 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A117	000000
M4.5 × 0.75 mm	Metric	-0.005 mm to 0.005 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A202	000000
M5 × 0.5 mm	Metric	-0.005 mm to 0.005 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A203	000000
M5 × 0.8 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A119	000000
M6 × 0.75 mm	Metric	-0.005 mm to 0.005 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A204	000000
M6 × 1 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A121	000000
M7 × 1 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A122	000000
M8 × 0.75 mm	Metric	-0.005 mm to 0.005 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A205	000000
M8 × 1 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A124	000000
M8 × 1.25 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A123	000000
M9 × 1 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A207	000000
M9 × 1.25 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A206	000000
M10 × 1 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A208	000000
M10 × 1.25 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A126	000000
M10 × 1.5 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A125	000000
M11 × 1 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A209	000000
M11 × 1.5 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A21	000000
M12 × 1 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A131	000000
M12 × 1.25 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A129	000000
M12 × 1.5 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A128	000000
M12 × 1.75 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A127	000000
M14 × 1 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A213	000000
M14 × 1.25 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A212	000000
M14 × 1.5 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A132	000000
M14 × 2 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A211	000000
M16 × 1 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A214	000000
M16 × 1.5 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A133	000000
M16 × 2 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A134	000000
M18 × 1 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A216	000000
M18 × 1.5 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A135	000000
M18 × 2.5 mm	Metric	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A215	000000
M20 × 1 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A219	000000
M20 × 1.5 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A218	000000
M20 × 2.5 mm	Metric	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A217	000000
M22 × 1.5 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A221	000000
M22 × 2.5 mm	Metric	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A22	000000
M24 × 1.5 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A223	000000
M24 × 2 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A224	000000
M24 × 3 mm	Metric	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A222	000000
M26 × 1.5 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A225	000000
M27 × 2 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A226	000000
M27 × 3 mm	Metric	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A227	000000
M30 × 1.5 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A228	000000
M30 × 2 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A23	000000
M30 × 3.5 mm	Metric	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A229	000000
M33 × 2 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A231	000000
M33 × 3.5 mm	Metric	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A232	000000
M35 × 1.5 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A233	000000
M36 × 1.5 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A234	000000
M36 × 2 mm	Metric	-0.008 mm to 0.008 mm	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A235	000000
M36 × 4 mm	Metric	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A236	000000

Plug Gauges with Handle

Take go and no-go measurements with the same tool. These gauges have a go gauge on one end, a no-go gauge on the other end, and a handle with bushings. They are used for precision go/no-go measuring of hole sizes and depths, checking hole location and distance, and setting micrometers. All come with an accuracy certificate traceable to NIST.

Check the minimum hole diameter with the go gauge end, and check the maximum hole diameter with the no-go gauge end. If the go gauge enters the hole and the no-go gauge is unable to enter, the hole is within tolerance.

	Plug Gauge Size		Plug Gauge Size Tolerance
	Go	No-Go	Go	No-Go	Lg.	Surface Smoothness, RMS, μin	Hardness	Material	Specs. Met	Features		Each
Class X Gauge



		0.0040" to 0.0250"	0.0040" to 0.0250"	0" to 0.00004"	-0.00004" to 0"	5 1/4"	4	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	2328A21	000000


		0.0251" to 0.0750"	0.0251" to 0.0750"	0" to 0.00004"	-0.00004" to 0"	5 1/4"	4	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	2328A83	00000
		0.0751" to 0.1800"	0.0751" to 0.1800"	0" to 0.00004"	-0.00004" to 0"	5 15/32"	4	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	2328A84	00000
		0.1801" to 0.2810"	0.1801" to 0.2810"	0" to 0.00004"	-0.00004" to 0"	6 1/8"	4	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	2328A85	00000
		0.2811" to 0.4060"	0.2811" to 0.4060"	0" to 0.00004"	-0.00004" to 0"	6 19/32"	4	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	2328A86	00000
		0.4061" to 0.5100"	0.4061" to 0.5100"	0" to 0.00004"	-0.00004" to 0"	7 3/16"	4	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	2328A87	00000
		0.5101" to 0.6350"	0.5101" to 0.6350"	0" to 0.00004"	-0.00004" to 0"	7 17/32"	4	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	2328A88	00000
		0.6351" to 0.7600"	0.6351" to 0.7600"	0" to 0.00004"	-0.00004" to 0"	7 21/32"	4	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	2328A89	00000
		0.7601" to 1.0000"	0.7601" to 1.0000"	0" to 0.00006"	-0.00006" to 0"	8 1/4"	4	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	2328A91	00000
		0.1010 mm to 0.3810 mm	0.1010 mm to 0.3810 mm	0 mm to 0.001 mm	-0.001 mm to 0 mm	5 1/4"	4	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	2328A41	000000
		0.3820 mm to 0.7620 mm	0.3820 mm to 0.7620 mm	0 mm to 0.001 mm	-0.001 mm to 0 mm	5 1/4"	4	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	2328A42	00000


		0.7630 mm to 1.9050 mm	0.7630 mm to 1.9050 mm	0 mm to 0.001 mm	-0.001 mm to 0 mm	5 1/4"	4	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	2328A43	00000
		1.9060 mm to 4.5720 mm	1.9060 mm to 4.5720 mm	0 mm to 0.001 mm	-0.001 mm to 0 mm	5 1/2"	4	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	2328A44	00000
		4.5730 mm to 7.1370 mm	4.5730 mm to 7.1370 mm	0 mm to 0.001 mm	-0.001 mm to 0 mm	6 1/8"	4	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	2328A45	00000
		7.1380 mm to 10.3120 mm	7.1380 mm to 10.3120 mm	0 mm to 0.001 mm	-0.001 mm to 0 mm	6 3/4"	4	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	2328A46	00000
		10.3130 mm to 12.9540 mm	10.3130 mm to 12.9540 mm	0 mm to 0.001 mm	-0.001 mm to 0 mm	7 1/4"	4	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	2328A47	00000
		12.9550 mm to 16.1290 mm	12.9550 mm to 16.1290 mm	0 mm to 0.001 mm	-0.001 mm to 0 mm	7 1/2"	4	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	2328A48	00000
		16.1300 mm to 19.3040 mm	16.1300 mm to 19.3040 mm	0 mm to 0.001 mm	-0.001 mm to 0 mm	7 3/4"	4	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	2328A49	00000
		19.3050 mm to 25.6540 mm	19.3050 mm to 25.6540 mm	0 mm to 0.001 mm	-0.001 mm to 0 mm	8 1/4"	4	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	2328A51	000000


		Class Z Gauge



				0.0050" to 0.0755"	0.0050" to 0.0755"	0" to 0.0001"	-0.0001" to 0"	5 1/4"	8	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	21205A211	00000


				0.0760" to 0.1805"	0.0760" to 0.1805"	0" to 0.0001"	-0.0001" to 0"	5 15/32"	8	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	21205A221	00000
				0.1810" to 0.2815"	0.1810" to 0.2815"	0" to 0.0001"	-0.0001" to 0"	6 1/8"	8	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	21205A231	00000
				0.2820" to 0.4065"	0.2820" to 0.4065"	0" to 0.0001"	-0.0001" to 0"	6 19/32"	8	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	21205A241	00000
				0.4070" to 0.5105"	0.4070" to 0.5105"	0" to 0.0001"	-0.0001" to 0"	7 3/16"	8	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	21205A251	00000
				0.5110" to 0.6355"	0.5110" to 0.6355"	0" to 0.0001"	-0.0001" to 0"	7 3/16"	8	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	21205A26	00000
				0.6360" to 0.7605"	0.6360" to 0.7605"	0" to 0.0001"	-0.0001" to 0"	7 17/32"	8	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	21205A27	00000
				0.7610" to 1.0150"	0.7610" to 1.0150"	0" to 0.0001"	-0.0001" to 0"	7 17/32"	8	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	21205A28	00000
				0.2200 mm to 1.9100 mm	0.2200 mm to 1.9100 mm	0 mm to 0.0025 mm	-0.0025 mm to 0 mm	5 1/4"	8	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	21205A71	00000
				1.9200 mm to 4.5700 mm	1.9200 mm to 4.5700 mm	0 mm to 0.0025 mm	-0.0025 mm to 0 mm	5 15/32"	8	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	21205A721	00000
				4.5800 mm to 7.1400 mm	4.5800 mm to 7.1400 mm	0 mm to 0.0025 mm	-0.0025 mm to 0 mm	6 1/8"	8	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	21205A73	00000


				7.1500 mm to 10.3100 mm	7.1500 mm to 10.3100 mm	0 mm to 0.0025 mm	-0.0025 mm to 0 mm	6 19/32"	8	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	21205A74	00000
				10.3200 mm to 12.9500 mm	10.3200 mm to 12.9500 mm	0 mm to 0.0025 mm	-0.0025 mm to 0 mm	7 3/16"	8	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	21205A75	00000
				12.9600 mm to 16.1300 mm	12.9600 mm to 16.1300 mm	0 mm to 0.0025 mm	-0.0025 mm to 0 mm	7 17/32"	8	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	21205A77	00000
				16.1400 mm to 19.3000 mm	16.1400 mm to 19.3000 mm	0 mm to 0.0025 mm	-0.0025 mm to 0 mm	7 17/32"	8	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	21205A78	00000
				19.3100 mm to 25.6500 mm	19.3100 mm to 25.6500 mm	0 mm to 0.0025 mm	-0.0025 mm to 0 mm	7 21/32"	8	Rockwell C60	Tool Steel	ASME B89.1.5	Handle	21205A79	000000

Wear-Indicating Plug Gauges

A black-oxide treatment on these gauges shows wear patterns so you can tell when you need to calibrate or replace the gauge. They help you measure hole sizes and depths, check hole location and distance, and set micrometers. All come with an accuracy certificate traceable to NIST that states they’ve passed a test for accuracy.

If a go gauge can enter the hole and a no-go gauge is unable to enter, the hole is within tolerance.

Go Gauges—Go gauges check the minimum hole diameter.

No-Go Gauges—No-go gauges check the maximum hole diameter.

							Go Gauges			No-Go Gauges
	Choose a Plug Gauge Size	Lg.	Surface Smoothness, RMS, μin	Hardness	Material	Specs. Met	Plug Gauge Size Tolerance		Each	Plug Gauge Size Tolerance		Each
Class ZZ Gauge



		0.0110" to 0.0605"	2"	10	Rockwell C60	Black-Oxide Tool Steel	ASME B89.1.5	0" to 0.0002"	2320A001	00000	-0.0002" to 0"	2321A001	00000


		0.0610" to 0.5005"	2"	10	Rockwell C60	Black-Oxide Tool Steel	ASME B89.1.5	0" to 0.0002"	2320A002	0000	-0.0002" to 0"	2321A002	0000
		0.5010" to 0.6255"	2"	10	Rockwell C60	Black-Oxide Tool Steel	ASME B89.1.5	0" to 0.0002"	2320A003	0000	-0.0002" to 0"	2321A003	0000
		0.6260" to 0.7505"	2"	10	Rockwell C60	Black-Oxide Tool Steel	ASME B89.1.5	0" to 0.0002"	2320A004	0000	-0.0002" to 0"	2321A004	0000

Plug Gauge Sets

Keep dozens of plug gauges on hand to check a range of hole sizes. You’ll often hear them called pin gauges. Use them to measure hole size and depth with precise go/no-go tests, check hole location and distance, and set micrometers. Sets include a manufacturer's certificate of accuracy to certify diameters are within tolerance. Gauges are tool steel, so they’re strong, hard, and resist wear.

If a go gauge can enter the hole and a no-go gauge is unable to enter, the hole is within tolerance.

Choose a class based on the level of precision you need—the smaller the tolerance, the greater the accuracy. Classes are based on ASME standard B89.1.5, which states diameter won’t vary more than the listed plug gauge tolerance.

Case

Go Gauges—Go gauges check the minimum hole diameter.

No-Go Gauges—No-go gauges check the maximum hole diameter.

Class X Gauge—Class X gauges are the most accurate type we sell. Use them for high-precision work.

Class Z Gauge—Class Z gauges are the most common. You'll often find them used on shop floors.

Class ZZ Gauge—Class ZZ gauges are ideal for quick checks that don't require extreme precision.

Black-Oxide Tool Steel—Black-oxide tool steel gauges show wear patterns, so you know when to calibrate or replace them.

	Plug Gauge Size	Increment	No. of Pieces	Lg.	Surface Smoothness, RMS, μin	Material	Plug Gauge Size Tolerance	Specs. Met		Each
Go Gauges







				Class X Gauge

				0.0110" to 0.0600"	0.001"	50	2"	4	Tool Steel	0" to 0.00004"	ASME B89.1.5	2326A612	0000000


				0.0110" to 0.2500"	0.001"	240	2"	4	Tool Steel	0" to 0.00004"	ASME B89.1.5	2326A621	00000000
				0.0115" to 0.0605"	0.001"	50	2"	4	Tool Steel	0" to 0.00004"	ASME B89.1.5	2326A614	000000
				0.0115" to 0.2505"	0.001"	240	2"	4	Tool Steel	0" to 0.00004"	ASME B89.1.5	2326A623	00000000
				0.0610" to 0.2500"	0.001"	190	2"	4	Tool Steel	0" to 0.00004"	ASME B89.1.5	2326A616	00000000
				0.0615" to 0.2505"	0.001"	190	2"	4	Tool Steel	0" to 0.00004"	ASME B89.1.5	2326A618	00000000
				0.2510" to 0.5000"	0.001"	250	2"	4	Tool Steel	0" to 0.00004"	ASME B89.1.5	2326A625	00000000
				0.2515" to 0.5005"	0.001"	250	2"	4	Tool Steel	0" to 0.00004"	ASME B89.1.5	2326A627	00000000
				0.5010" to 0.6250"	0.001"	125	2"	4	Tool Steel	0" to 0.00004"	ASME B89.1.5	2326A629	00000000
				0.5015" to 0.6255"	0.001"	125	2"	4	Tool Steel	0" to 0.00004"	ASME B89.1.5	2326A632	00000000
				0.6260" to 0.7500"	0.001"	125	2"	4	Tool Steel	0" to 0.00004"	ASME B89.1.5	2326A634	00000000


				0.6265" to 0.7505"	0.001"	125	2"	4	Tool Steel	0" to 0.00004"	ASME B89.1.5	2326A636	00000000
				0.7510" to 0.8320"	0.001"	82	2"	4	Tool Steel	0" to 0.00006"	ASME B89.1.5	2326A638	00000000
				0.7515" to 0.8325"	0.001"	82	2"	4	Tool Steel	0" to 0.00006"	ASME B89.1.5	2326A641	00000000
				0.8330" to 0.9160"	0.001"	84	2"	4	Tool Steel	0" to 0.00006"	ASME B89.1.5	2326A643	00000000
				0.8335" to 0.9165"	0.001"	84	2"	4	Tool Steel	0" to 0.00006"	ASME B89.1.5	2326A645	00000000
				0.9170" to 1.0000"	0.001"	84	2"	4	Tool Steel	0" to 0.00006"	ASME B89.1.5	2326A647	00000000
				0.9175" to 1.0005"	0.001"	84	2"	4	Tool Steel	0" to 0.00006"	ASME B89.1.5	2326A649	00000000




						Class Z Gauge

						0.0110" to 0.0600"	0.001"	50	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	2326A11	000000


						0.0110" to 0.2500"	0.001"	240	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	2326A19	000000
						0.0115" to 0.0605"	0.001"	50	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	2326A21	000000
						0.0115" to 0.2505"	0.001"	240	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	2326A29	000000
						0.0610" to 0.2500"	0.001"	190	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	2326A12	000000
						0.0615" to 0.2505"	0.001"	190	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	2326A22	000000
						0.2510" to 0.5000"	0.001"	250	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	2326A13	000000
						0.2515" to 0.5005"	0.001"	250	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	2326A23	000000
						0.5010" to 0.6250"	0.001"	125	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	2326A14	000000
						0.5015" to 0.6255"	0.001"	125	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	2326A44	000000
						0.6260" to 0.7500"	0.001"	125	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	2326A15	000000


						0.6265" to 0.7505"	0.001"	125	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	2326A45	000000
						0.7510" to 0.8320"	0.001"	82	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	2326A16	000000
						0.7515" to 0.8325"	0.001"	82	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	2326A46	000000
						0.8330" to 0.9160"	0.001"	84	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	2326A51	00000000
						0.8335" to 0.9165"	0.001"	84	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	2326A47	00000000
						0.9170" to 1.0000"	0.001"	84	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	2326A52	00000000
						0.9175" to 1.0005"	0.001"	84	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	2326A48	00000000
						0.2200 mm to 1.5000 mm	0.02 mm	65	2"	8	Tool Steel	0 mm to 0.0025 mm	ASME B89.1.5	2326A61	000000
						0.2300 mm to 1.5100 mm	0.02 mm	65	2"	8	Tool Steel	0 mm to 0.0025 mm	ASME B89.1.5	2326A512	000000
						1.5200 mm to 7.7000 mm	0.02 mm	310	2"	8	Tool Steel	0 mm to 0.0025 mm	ASME B89.1.5	2326A514	000000


1.5300 mm to 7.7100 mm						0.02 mm	310	2"	8	Tool Steel	0 mm to 0.0025 mm	ASME B89.1.5	2326A516	000000
7.7200 mm to 12.7000 mm	0.02 mm					250	2"	8	Tool Steel	0 mm to 0.0025 mm	ASME B89.1.5	2326A518	000000
7.7300 mm to 12.7100 mm	0.02 mm					250	2"	8	Tool Steel	0 mm to 0.0025 mm	ASME B89.1.5	2326A521	000000
12.7200 mm to 15.3000 mm	0.02 mm					130	2"	8	Tool Steel	0 mm to 0.0025 mm	ASME B89.1.5	2326A523	000000
12.7300 mm to 15.3100 mm	0.02 mm					130	2"	8	Tool Steel	0 mm to 0.0025 mm	ASME B89.1.5	2326A525	000000
15.3200 mm to 17.8000 mm	0.02 mm	125				2"	8	Tool Steel	0 mm to 0.0025 mm	ASME B89.1.5	2326A527	000000
15.3300 mm to 17.8100 mm	0.02 mm	125	2"			8	Tool Steel	0 mm to 0.0025 mm	ASME B89.1.5	2326A529	000000
17.8200 mm to 20.3600 mm	0.02 mm	128	2"			8	Tool Steel	0 mm to 0.0025 mm	ASME B89.1.5	2326A532	000000
17.8300 mm to 20.3700 mm	0.02 mm	128	2"			8	Tool Steel	0 mm to 0.0025 mm	ASME B89.1.5	2326A534	000000




		Class ZZ Gauge

		0.0060" to 0.0600"	0.001"			55	2"	10	Black-Oxide Tool Steel	0" to 0.0002"	ASME B89.1.5	2326A111	000000


		0.0065" to 0.0605"	0.001"			55	2"	10	Black-Oxide Tool Steel	0" to 0.0002"	ASME B89.1.5	2326A112	000000
		0.0110" to 0.0600"	0.001"			50	2"	10	Black-Oxide Tool Steel	0" to 0.0002"	ASME B89.1.5	2327A11	00000
		0.0110" to 0.2500"	0.001"			240	2"	10	Black-Oxide Tool Steel	0" to 0.0002"	ASME B89.1.5	2326A114	000000
		0.0115" to 0.0605"	0.001"			50	2"	10	Black-Oxide Tool Steel	0" to 0.0002"	ASME B89.1.5	2326A113	00000
		0.0115" to 0.2505"	0.001"			240	2"	10	Black-Oxide Tool Steel	0" to 0.0002"	ASME B89.1.5	2326A115	000000
		0.0610" to 0.2500"	0.001"			190	2"	10	Black-Oxide Tool Steel	0" to 0.0002"	ASME B89.1.5	2327A12	000000
		0.0615" to 0.2505"	0.001"			190	2"	10	Black-Oxide Tool Steel	0" to 0.0002"	ASME B89.1.5	2326A116	000000
		0.2510" to 0.5000"	0.001"			250	2"	10	Black-Oxide Tool Steel	0" to 0.0002"	ASME B89.1.5	2327A13	000000
		0.2515" to 0.5005"	0.001"			250	2"	10	Black-Oxide Tool Steel	0" to 0.0002"	ASME B89.1.5	2326A117	000000
		0.5010" to 0.6250"	0.001"			125	2"	10	Black-Oxide Tool Steel	0" to 0.0002"	ASME B89.1.5	2327A14	000000


		0.5015" to 0.6255"	0.001"			125	2"	10	Black-Oxide Tool Steel	0" to 0.0002"	ASME B89.1.5	2326A118	000000
		0.6260" to 0.7500"	0.001"			125	2"	10	Black-Oxide Tool Steel	0" to 0.0002"	ASME B89.1.5	2327A15	000000
		0.6265" to 0.7505"	0.001"			125	2"	10	Black-Oxide Tool Steel	0" to 0.0002"	ASME B89.1.5	2326A119	000000
		0.7510" to 0.8320"	0.001"			82	2"	10	Black-Oxide Tool Steel	0" to 0.0002"	ASME B89.1.5	2326A121	000000
		0.7515" to 0.8325"	0.001"	82		2"	10	Black-Oxide Tool Steel	0" to 0.0002"	ASME B89.1.5	2326A122	000000
		0.8330" to 0.9160"	0.001"	84	2"	10	Black-Oxide Tool Steel	0" to 0.0002"	ASME B89.1.5	2326A123	000000
		0.8335" to 0.9165"	0.001"	84	2"	10	Black-Oxide Tool Steel	0" to 0.0002"	ASME B89.1.5	2326A124	000000
		0.9170" to 1.0000"	0.001"	84	2"	10	Black-Oxide Tool Steel	0" to 0.0002"	ASME B89.1.5	2326A125	000000
		0.9175" to 1.0005"	0.001"	84	2"	10	Black-Oxide Tool Steel	0" to 0.0002"	ASME B89.1.5	2326A126	000000
		0.2000 mm to 1.2800 mm	0.02 mm	55	2"	10	Black-Oxide Tool Steel	0 mm to 0.005 mm	ASME B89.1.5	2326A311	000000


		0.2100 mm to 1.2900 mm	0.02 mm	55	2"	10	Black-Oxide Tool Steel	0 mm to 0.005 mm	ASME B89.1.5	2326A312	000000
		1.3000 mm to 4.9800 mm	0.02 mm	185	2"	10	Black-Oxide Tool Steel	0 mm to 0.005 mm	ASME B89.1.5	2326A313	000000
		1.3000 mm to 4.9800 mm	0.02 mm	185	2"	10	Tool Steel	0 mm to 0.005 mm	ASME B89.1.5	2326A69	000000
		1.3100 mm to 4.9900 mm	0.02 mm	185	2"	10	Black-Oxide Tool Steel	0 mm to 0.005 mm	ASME B89.1.5	2326A314	000000
		5.0000 mm to 9.9800 mm	0.02 mm	250	2"	10	Black-Oxide Tool Steel	0 mm to 0.005 mm	ASME B89.1.5	2326A315	000000
		5.0000 mm to 9.9800 mm	0.02 mm	250	2"	10	Tool Steel	0 mm to 0.005 mm	ASME B89.1.5	2326A71	000000
		5.0100 mm to 9.9900 mm	0.02 mm	250	2"	10	Black-Oxide Tool Steel	0 mm to 0.005 mm	ASME B89.1.5	2326A316	000000
		10.0000 mm to 13.9800 mm	0.02 mm	200	2"	10	Black-Oxide Tool Steel	0 mm to 0.005 mm	ASME B89.1.5	2326A317	000000
		10.0000 mm to 13.9800 mm	0.02 mm	200	2"	10	Tool Steel	0 mm to 0.005 mm	ASME B89.1.5	2326A72	000000
		10.0100 mm to 13.9900 mm	0.02 mm	200	2"	10	Black-Oxide Tool Steel	0 mm to 0.005 mm	ASME B89.1.5	2326A318	000000


		14.0000 mm to 16.4800 mm	0.02 mm	125	2"	10	Black-Oxide Tool Steel	0 mm to 0.005 mm	ASME B89.1.5	2326A319	000000
		14.0100 mm to 16.4900 mm	0.02 mm	125	2"	10	Black-Oxide Tool Steel	0 mm to 0.005 mm	ASME B89.1.5	2326A321	000000
		16.5000 mm to 18.9800 mm	0.02 mm	125	2"	10	Black-Oxide Tool Steel	0 mm to 0.005 mm	ASME B89.1.5	2326A322	000000
		16.5100 mm to 18.9900 mm	0.02 mm	125	2"	10	Black-Oxide Tool Steel	0 mm to 0.005 mm	ASME B89.1.5	2326A323	000000
		19.0000 mm to 20.9800 mm	0.02 mm	100	2"	10	Black-Oxide Tool Steel	0 mm to 0.0061 mm	ASME B89.1.5	2326A324	000000
		19.0100 mm to 20.9900 mm	0.02 mm	100	2"	10	Black-Oxide Tool Steel	0 mm to 0.0061 mm	ASME B89.1.5	2326A325	000000


		No-Go Gauges







						Class X Gauge

						0.0110" to 0.0600"	0.001"	50	2"	4	Tool Steel	-0.00004" to 0"	ASME B89.1.5	2326A611	000000


0.0110" to 0.2500"						0.001"	240	2"	4	Tool Steel	-0.00004" to 0"	ASME B89.1.5	2326A619	00000000
0.0115" to 0.0605"	0.001"					50	2"	4	Tool Steel	-0.00004" to 0"	ASME B89.1.5	2326A613	000000
0.0115" to 0.2505"	0.001"					240	2"	4	Tool Steel	-0.00004" to 0"	ASME B89.1.5	2326A622	00000000
0.0610" to 0.2500"	0.001"					190	2"	4	Tool Steel	-0.00004" to 0"	ASME B89.1.5	2326A615	00000000
0.0615" to 0.2505"	0.001"					190	2"	4	Tool Steel	-0.00004" to 0"	ASME B89.1.5	2326A617	00000000
0.2510" to 0.5000"	0.001"					250	2"	4	Tool Steel	-0.00004" to 0"	ASME B89.1.5	2326A624	00000000
0.2515" to 0.5005"	0.001"					250	2"	4	Tool Steel	-0.00004" to 0"	ASME B89.1.5	2326A626	00000000
0.5010" to 0.6250"	0.001"					125	2"	4	Tool Steel	-0.00004" to 0"	ASME B89.1.5	2326A628	00000000
0.5015" to 0.6255"	0.001"					125	2"	4	Tool Steel	-0.00004" to 0"	ASME B89.1.5	2326A631	00000000
0.6260" to 0.7500"	0.001"					125	2"	4	Tool Steel	-0.00004" to 0"	ASME B89.1.5	2326A633	00000000


0.6265" to 0.7505"	0.001"					125	2"	4	Tool Steel	-0.00004" to 0"	ASME B89.1.5	2326A635	00000000
0.7510" to 0.8320"	0.001"					82	2"	4	Tool Steel	-0.00006" to 0"	ASME B89.1.5	2326A637	00000000
0.7515" to 0.8325"	0.001"					82	2"	4	Tool Steel	-0.00006" to 0"	ASME B89.1.5	2326A639	00000000
0.8330" to 0.9160"	0.001"					84	2"	4	Tool Steel	-0.00006" to 0"	ASME B89.1.5	2326A642	00000000
0.8335" to 0.9165"	0.001"					84	2"	4	Tool Steel	-0.00006" to 0"	ASME B89.1.5	2326A644	00000000
0.9170" to 1.0000"	0.001"					84	2"	4	Tool Steel	-0.00006" to 0"	ASME B89.1.5	2326A646	00000000
0.9175" to 1.0005"	0.001"					84	2"	4	Tool Steel	-0.00006" to 0"	ASME B89.1.5	2326A648	00000000




						Class Z Gauge

						0.0110" to 0.0600"	0.001"	50	2"	8	Tool Steel	-0.0001" to 0"	ASME B89.1.5	2326A31	000000


						0.0110" to 0.2500"	0.001"	240	2"	8	Tool Steel	-0.0001" to 0"	ASME B89.1.5	2326A39	000000
						0.0115" to 0.0605"	0.001"	50	2"	8	Tool Steel	-0.0001" to 0"	ASME B89.1.5	2326A41	000000
						0.0115" to 0.2505"	0.001"	240	2"	8	Tool Steel	-0.0001" to 0"	ASME B89.1.5	2326A49	000000
						0.0610" to 0.2500"	0.001"	190	2"	8	Tool Steel	-0.0001" to 0"	ASME B89.1.5	2326A32	000000
						0.0615" to 0.2505"	0.001"	190	2"	8	Tool Steel	-0.0001" to 0"	ASME B89.1.5	2326A42	000000
						0.2510" to 0.5000"	0.001"	250	2"	8	Tool Steel	-0.0001" to 0"	ASME B89.1.5	2326A33	000000
						0.2515" to 0.5005"	0.001"	250	2"	8	Tool Steel	-0.0001" to 0"	ASME B89.1.5	2326A43	000000
						0.5010" to 0.6250"	0.001"	125	2"	8	Tool Steel	-0.0001" to 0"	ASME B89.1.5	2326A34	000000
						0.5015" to 0.6255"	0.001"	125	2"	8	Tool Steel	-0.0001" to 0"	ASME B89.1.5	2326A24	000000
						0.6260" to 0.7500"	0.001"	125	2"	8	Tool Steel	-0.0001" to 0"	ASME B89.1.5	2326A35	000000


						0.6265" to 0.7505"	0.001"	125	2"	8	Tool Steel	-0.0001" to 0"	ASME B89.1.5	2326A25	000000
						0.7510" to 0.8320"	0.001"	82	2"	8	Tool Steel	-0.0001" to 0"	ASME B89.1.5	2326A36	000000
						0.7515" to 0.8325"	0.001"	82	2"	8	Tool Steel	-0.0001" to 0"	ASME B89.1.5	2326A26	000000
						0.8330" to 0.9160"	0.001"	84	2"	8	Tool Steel	-0.0001" to 0"	ASME B89.1.5	2326A37	00000000
						0.8335" to 0.9165"	0.001"	84	2"	8	Tool Steel	-0.0001" to 0"	ASME B89.1.5	2326A27	00000000
						0.9170" to 1.0000"	0.001"	84	2"	8	Tool Steel	-0.0001" to 0"	ASME B89.1.5	2326A38	00000000
						0.9175" to 1.0005"	0.001"	84	2"	8	Tool Steel	-0.0001" to 0"	ASME B89.1.5	2326A28	00000000
						0.2200 mm to 1.5000 mm	0.02 mm	65	2"	8	Tool Steel	-0.0025 mm to 0 mm	ASME B89.1.5	2326A65	000000
						0.2300 mm to 1.5100 mm	0.02 mm	65	2"	8	Tool Steel	-0.0025 mm to 0 mm	ASME B89.1.5	2326A511	000000
						1.5200 mm to 7.7000 mm	0.02 mm	310	2"	8	Tool Steel	-0.0025 mm to 0 mm	ASME B89.1.5	2326A513	000000


		1.5300 mm to 7.7100 mm				0.02 mm	310	2"	8	Tool Steel	-0.0025 mm to 0 mm	ASME B89.1.5	2326A515	000000
		7.7200 mm to 12.7000 mm	0.02 mm			250	2"	8	Tool Steel	-0.0025 mm to 0 mm	ASME B89.1.5	2326A517	000000
		7.7300 mm to 12.7100 mm	0.02 mm			250	2"	8	Tool Steel	-0.0025 mm to 0 mm	ASME B89.1.5	2326A519	000000
		12.7200 mm to 15.3000 mm	0.02 mm			130	2"	8	Tool Steel	-0.0025 mm to 0 mm	ASME B89.1.5	2326A522	000000
		12.7300 mm to 15.3100 mm	0.02 mm			130	2"	8	Tool Steel	-0.0025 mm to 0 mm	ASME B89.1.5	2326A524	000000
		15.3200 mm to 17.8000 mm	0.02 mm	125		2"	8	Tool Steel	-0.0025 mm to 0 mm	ASME B89.1.5	2326A526	000000
		15.3300 mm to 17.8100 mm	0.02 mm	125	2"	8	Tool Steel	-0.0025 mm to 0 mm	ASME B89.1.5	2326A528	000000
		17.8200 mm to 20.3600 mm	0.02 mm	128	2"	8	Tool Steel	-0.0025 mm to 0 mm	ASME B89.1.5	2326A531	000000
		17.8300 mm to 20.3700 mm	0.02 mm	128	2"	8	Tool Steel	-0.0025 mm to 0 mm	ASME B89.1.5	2326A533	000000




				Class ZZ Gauge

				0.0060" to 0.0600"	0.001"	55	2"	10	Black-Oxide Tool Steel	-0.0002" to 0"	ASME B89.1.5	2326A211	000000


				0.0065" to 0.0605"	0.001"	55	2"	10	Black-Oxide Tool Steel	-0.0002" to 0"	ASME B89.1.5	2326A212	000000
				0.0110" to 0.0600"	0.001"	50	2"	10	Black-Oxide Tool Steel	-0.0002" to 0"	ASME B89.1.5	2327A21	00000
				0.0110" to 0.2500"	0.001"	240	2"	10	Black-Oxide Tool Steel	-0.0002" to 0"	ASME B89.1.5	2326A214	000000
				0.0115" to 0.0605"	0.001"	50	2"	10	Black-Oxide Tool Steel	-0.0002" to 0"	ASME B89.1.5	2326A213	00000
				0.0115" to 0.2505"	0.001"	240	2"	10	Black-Oxide Tool Steel	-0.0002" to 0"	ASME B89.1.5	2326A215	000000
				0.0610" to 0.2500"	0.001"	190	2"	10	Black-Oxide Tool Steel	-0.0002" to 0"	ASME B89.1.5	2327A22	000000
				0.0615" to 0.2505"	0.001"	190	2"	10	Black-Oxide Tool Steel	-0.0002" to 0"	ASME B89.1.5	2326A216	000000
				0.2510" to 0.5000"	0.001"	250	2"	10	Black-Oxide Tool Steel	-0.0002" to 0"	ASME B89.1.5	2327A23	000000
				0.2515" to 0.5005"	0.001"	250	2"	10	Black-Oxide Tool Steel	-0.0002" to 0"	ASME B89.1.5	2326A217	000000
				0.5010" to 0.6250"	0.001"	125	2"	10	Black-Oxide Tool Steel	-0.0002" to 0"	ASME B89.1.5	2327A24	000000


				0.5015" to 0.6255"	0.001"	125	2"	10	Black-Oxide Tool Steel	-0.0002" to 0"	ASME B89.1.5	2326A218	000000
				0.6260" to 0.7500"	0.001"	125	2"	10	Black-Oxide Tool Steel	-0.0002" to 0"	ASME B89.1.5	2327A25	000000
				0.6265" to 0.7505"	0.001"	125	2"	10	Black-Oxide Tool Steel	-0.0002" to 0"	ASME B89.1.5	2326A219	000000
0.7510" to 0.8320"				0.001"	82	2"	10	Black-Oxide Tool Steel	-0.0002" to 0"	ASME B89.1.5	2326A221	000000
0.7515" to 0.8325"	0.001"			82	2"	10	Black-Oxide Tool Steel	-0.0002" to 0"	ASME B89.1.5	2326A222	000000
0.8330" to 0.9160"	0.001"			84	2"	10	Black-Oxide Tool Steel	-0.0002" to 0"	ASME B89.1.5	2326A223	000000
0.8335" to 0.9165"	0.001"			84	2"	10	Black-Oxide Tool Steel	-0.0002" to 0"	ASME B89.1.5	2326A224	000000
0.9170" to 1.0000"	0.001"			84	2"	10	Black-Oxide Tool Steel	-0.0002" to 0"	ASME B89.1.5	2326A225	000000
0.9175" to 1.0005"	0.001"			84	2"	10	Black-Oxide Tool Steel	-0.0002" to 0"	ASME B89.1.5	2326A226	000000
0.2000 mm to 1.2800 mm	0.02 mm			55	2"	10	Black-Oxide Tool Steel	-0.005 mm to 0 mm	ASME B89.1.5	2326A411	000000


0.2100 mm to 1.2900 mm	0.02 mm			55	2"	10	Black-Oxide Tool Steel	-0.005 mm to 0 mm	ASME B89.1.5	2326A412	000000
1.3000 mm to 4.9800 mm	0.02 mm			185	2"	10	Black-Oxide Tool Steel	-0.005 mm to 0 mm	ASME B89.1.5	2326A413	000000
1.3000 mm to 4.9800 mm	0.02 mm			185	2"	10	Tool Steel	-0.005 mm to 0 mm	ASME B89.1.5	2326A73	000000
1.3100 mm to 4.9900 mm	0.02 mm			185	2"	10	Black-Oxide Tool Steel	-0.005 mm to 0 mm	ASME B89.1.5	2326A414	000000
5.0000 mm to 9.9800 mm	0.02 mm			250	2"	10	Black-Oxide Tool Steel	-0.005 mm to 0 mm	ASME B89.1.5	2326A415	000000
5.0000 mm to 9.9800 mm	0.02 mm			250	2"	10	Tool Steel	-0.005 mm to 0 mm	ASME B89.1.5	2326A74	000000
5.0100 mm to 9.9900 mm	0.02 mm			250	2"	10	Black-Oxide Tool Steel	-0.005 mm to 0 mm	ASME B89.1.5	2326A416	000000
10.0000 mm to 13.9800 mm	0.02 mm			200	2"	10	Black-Oxide Tool Steel	-0.005 mm to 0 mm	ASME B89.1.5	2326A417	000000
10.0000 mm to 13.9800 mm	0.02 mm			200	2"	10	Tool Steel	-0.005 mm to 0 mm	ASME B89.1.5	2326A75	000000
10.0100 mm to 13.9900 mm	0.02 mm			200	2"	10	Black-Oxide Tool Steel	-0.005 mm to 0 mm	ASME B89.1.5	2326A418	000000


14.0000 mm to 16.4800 mm	0.02 mm			125	2"	10	Black-Oxide Tool Steel	-0.005 mm to 0 mm	ASME B89.1.5	2326A419	000000
14.0100 mm to 16.4900 mm	0.02 mm			125	2"	10	Black-Oxide Tool Steel	-0.005 mm to 0 mm	ASME B89.1.5	2326A421	000000
16.5000 mm to 18.9800 mm	0.02 mm			125	2"	10	Black-Oxide Tool Steel	-0.005 mm to 0 mm	ASME B89.1.5	2326A422	000000
16.5100 mm to 18.9900 mm	0.02 mm			125	2"	10	Black-Oxide Tool Steel	-0.005 mm to 0 mm	ASME B89.1.5	2326A423	000000
19.0000 mm to 20.9800 mm	0.02 mm			100	2"	10	Black-Oxide Tool Steel	-0.0061 mm to 0 mm	ASME B89.1.5	2326A424	000000
19.0100 mm to 20.9900 mm	0.02 mm			100	2"	10	Black-Oxide Tool Steel	-0.0061 mm to 0 mm	ASME B89.1.5	2326A425	000000

Cabinet

Go Gauges—Go gauges check the minimum hole diameter.

No-Go Gauges—No-go gauges check the maximum hole diameter.

Class Z Gauge—Class Z gauges are the most common. You'll often find them used on shop floors.

	Lg.	Surface Smoothness, RMS, μin	Material	Plug Gauge Size Tolerance	Specs. Met		Each
Go Gauges







	Class Z Gauge

	0.0110" to 0.5005"	0.0005"	980	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	21015A1	000000000


	0.0110" to 0.6250"	0.001"	615	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	21015A11	00000000
	0.0110" to 0.7500"	0.001"	740	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	21015A13	00000000
	0.0110" to 1.0000"	0.001"	990	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	21015A14	00000000
	0.0115" to 0.7505"	0.001"	740	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	21015A15	00000000
	0.0115" to 1.0005"	0.001"	990	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	21015A16	00000000
	0.0610" to 0.5005"	0.0005"	880	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	21015A17	00000000
	0.0610" to 0.7500"	0.001"	690	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	21015A12	00000000
	0.0610" to 1.0000"	0.001"	940	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	21015A18	00000000
	0.0615" to 0.7505"	0.001"	690	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	21015A19	00000000
	0.0615" to 1.0005"	0.001"	940	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	21015A41	00000000


	0.7510" to 1.0000"	0.001"	250	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	21015A42	00000000
	0.7515" to 1.0005"	0.001"	250	2"	8	Tool Steel	0" to 0.0001"	ASME B89.1.5	21015A43	00000000
	1.5200 mm to 17.8000 mm	0.02 mm	815	2"	8	Tool Steel	0 mm to 0.0025 mm	ASME B89.1.5	21015A32	00000000
	1.5300 mm to 17.8100 mm	0.02 mm	815	2"	8	Tool Steel	0 mm to 0.0025 mm	ASME B89.1.5	21015A34	00000000


	No-Go Gauges







					Class Z Gauge

					0.0110" to 0.5005"	0.0005"	980	2"	8	Tool Steel	-0.0001" to 0"	ASME B89.1.5	21015A2	00000000


					0.0110" to 0.6250"	0.001"	615	2"	8	Tool Steel	-0.0001" to 0"	ASME B89.1.5	21015A21	00000000
					0.0110" to 0.7500"	0.001"	740	2"	8	Tool Steel	-0.0001" to 0"	ASME B89.1.5	21015A23	00000000
					0.0110" to 1.0000"	0.001"	990	2"	8	Tool Steel	-0.00012" to 0"	ASME B89.1.5	21015A24	00000000
					0.0115" to 0.7505"	0.001"	740	2"	8	Tool Steel	-0.0001" to 0"	ASME B89.1.5	21015A25	00000000
					0.0115" to 1.0005"	0.001"	990	2"	8	Tool Steel	-0.00012" to 0"	ASME B89.1.5	21015A26	00000000
					0.0610" to 0.5005"	0.0005"	880	2"	8	Tool Steel	-0.0001" to 0"	ASME B89.1.5	21015A27	00000000
					0.0610" to 0.7500"	0.001"	690	2"	8	Tool Steel	-0.0001" to 0"	ASME B89.1.5	21015A22	00000000
					0.0610" to 1.0000"	0.001"	940	2"	8	Tool Steel	-0.00012" to 0"	ASME B89.1.5	21015A28	00000000
					0.0615" to 0.7505"	0.001"	690	2"	8	Tool Steel	-0.0001" to 0"	ASME B89.1.5	21015A29	00000000
					0.0615" to 1.0005"	0.001"	940	2"	8	Tool Steel	-0.00012" to 0"	ASME B89.1.5	21015A51	00000000


					0.7510" to 1.0000"	0.001"	250	2"	8	Tool Steel	-0.00012" to 0"	ASME B89.1.5	21015A52	00000000
					0.7515" to 1.0005"	0.001"	250	2"	8	Tool Steel	-0.00012" to 0"	ASME B89.1.5	21015A53	00000000
					1.5200 mm to 17.8000 mm	0.02 mm	815	2"	8	Tool Steel	-0.00254 mm to 0 mm	ASME B89.1.5	21015A31	00000000
					1.5300 mm to 17.8100 mm	0.02 mm	815	2"	8	Tool Steel	-0.00254 mm to 0 mm	ASME B89.1.5	21015A33	00000000

Threaded Plug Gauges with Handle for Pipe Threads

Verify whether pipe fitting threads fall within tolerance. These gauges are attached to a handle, giving you a solid gripping point to thread and unthread them quickly. All are precisely manufactured to tight thread tolerances. If the gauges wear down, you can install new ones (not included) on the taperlock handle.

NPT Thread, NPTF Thread, and BSPT Thread—Gauges with NPT, NPTF, and BSPT threads have a notch to indicate whether the threads you’re checking are within tolerance. If it takes no more than one turn for the notch to sit flush against the end of your fitting, the threads are within tolerance.

NPSM Thread and BSPP Thread—Use gauges with NPSM and BSPP threads for go/no-go tests. The end with a go gauge checks the minimum internal thread size, and the end with a no-go gauge checks the maximum. Your fitting is within tolerance if it’s easy to thread in the go gauge but difficult to thread the no-go gauge more than two turns.

Plug Gauges with Calibration Certificate Traceable to NIST—Gauges with a calibration certificate traceable to NIST were calibrated in a lab. The certificate, sometimes called a test report or long-form certificate, details the tested measurements.

						Plug Gauges		Plug Gauges with Calibration Certificate Traceable to NIST
	Pipe Size	Pitch Dia. Tolerance	Hardness	Material	Features		Each		Each
NPT Thread



		1/16	-0.0002" to 0.0002"	Rockwell C60	Tool Steel	Taperlock Handle	2365A11	0000000	2121A111	0000000


		1/8	-0.0002" to 0.0002"	Rockwell C60	Tool Steel	Taperlock Handle	2365A111	000000	2121A112	000000
		1/4	-0.0002" to 0.0002"	Rockwell C60	Tool Steel	Taperlock Handle	2365A112	000000	2121A113	000000
		3/8	-0.0002" to 0.0002"	Rockwell C60	Tool Steel	Taperlock Handle	2365A113	000000	2121A114	000000
		1/2	-0.0003" to 0.0003"	Rockwell C60	Tool Steel	Taperlock Handle	2365A114	000000	2121A115	000000
		3/4	-0.0003" to 0.0003"	Rockwell C60	Tool Steel	Taperlock Handle	2365A115	000000	2121A116	000000
		1	-0.0003" to 0.0003"	Rockwell C60	Tool Steel	Taperlock Handle	2365A116	000000	2121A117	000000
		1 1/4	-0.0003" to 0.0003"	Rockwell C60	Tool Steel	Taperlock Handle	2365A117	000000	2121A118	000000
		1 1/2	-0.0003" to 0.0003"	Rockwell C60	Tool Steel	Taperlock Handle	2365A118	000000	2121A119	000000
		2	-0.0003" to 0.0003"	Rockwell C60	Tool Steel	Taperlock Handle	2365A119	000000	2121A121	000000
		2 1/2	-0.0005" to 0.0005"	Rockwell C60	Tool Steel	Taperlock Handle	2365A121	000000	2121A122	000000


		3	-0.0005" to 0.0005"	Rockwell C60	Tool Steel	Taperlock Handle	2365A222	000000	2121A144	000000
		4	-0.0005" to 0.0005"	Rockwell C60	Tool Steel	Taperlock Handle	2365A225	000000	2121A146	000000


		NPTF Thread



				1/16	-0.0002" to 0.0002"	Rockwell C60	Tool Steel	Taperlock Handle	6744N32	000000	6744N113	000000


				1/8	-0.0002" to 0.0002"	Rockwell C60	Tool Steel	Taperlock Handle	6744N33	000000	6744N114	000000
				1/4	-0.0002" to 0.0002"	Rockwell C60	Tool Steel	Taperlock Handle	6744N34	000000	6744N115	000000
				3/8	-0.0002" to 0.0002"	Rockwell C60	Tool Steel	Taperlock Handle	6744N35	000000	6744N116	000000
				1/2	-0.0002" to 0.0002"	Rockwell C60	Tool Steel	Taperlock Handle	6744N36	000000	6744N117	000000
				3/4	-0.0002" to 0.0002"	Rockwell C60	Tool Steel	Taperlock Handle	6744N37	000000	6744N118	000000


				NPSM Thread



						1/8	-0.0003" to 0.0003"	Rockwell C60	Tool Steel	Taperlock Handle	6744N11	000000	———	0


						1/4	-0.0003" to 0.0003"	Rockwell C60	Tool Steel	Taperlock Handle	6744N12	000000	———	0
						3/8	-0.0003" to 0.0003"	Rockwell C60	Tool Steel	Taperlock Handle	6744N13	000000	———	0
						1/2	-0.0003" to 0.0003"	Rockwell C60	Tool Steel	Taperlock Handle	6744N14	000000	———	0
						3/4	-0.0003" to 0.0003"	Rockwell C60	Tool Steel	Taperlock Handle	6744N15	000000	———	0


						BSPT Thread



								1/8	-0.0002" to 0.0002"	Rockwell C60	Tool Steel	Taperlock Handle	6744N21	000000	6744N101	000000


								1/4	-0.0002" to 0.0002"	Rockwell C60	Tool Steel	Taperlock Handle	6744N22	000000	6744N102	000000
								3/8	-0.0002" to 0.0002"	Rockwell C60	Tool Steel	Taperlock Handle	6744N23	000000	6744N103	000000
								1/2	-0.0003" to 0.0003"	Rockwell C60	Tool Steel	Taperlock Handle	6744N24	000000	6744N104	000000


								BSPP Thread



1/8	-0.0002" to 0.0002"									Rockwell C60	Tool Steel	Taperlock Handle	6744N25	000000	6744N105	000000


1/4	-0.0002" to 0.0002"									Rockwell C60	Tool Steel	Taperlock Handle	6744N26	000000	6744N106	000000
3/8	-0.0002" to 0.0002"									Rockwell C60	Tool Steel	Taperlock Handle	6744N27	000000	6744N107	000000
1/2	-0.0003" to 0.0003"									Rockwell C60	Tool Steel	Taperlock Handle	6744N28	000000	6744N108	000000
3/4	-0.0003" to 0.0003"									Rockwell C60	Tool Steel	Taperlock Handle	6744N29	000000	6744N109	000000
1	-0.0003" to 0.0003"									Rockwell C60	Tool Steel	Taperlock Handle	6744N3	000000	6744N111	000000
1 1/4	-0.0003" to 0.0003"									Rockwell C60	Tool Steel	Taperlock Handle	6744N31	000000	6744N112	000000

Target-Size Plug Gauge Sets

Get your choice of one target-size gauge with 12 larger gauges and 12 smaller gauges, graduated in 0.0001”. Use these sets to measure hole sizes and depths, check hole locations and distance, and set micrometers. Also known as tenth-step gauges, they’re often used in metrology labs, quality control departments, and tool rooms for setting snap gauges and comparators.

The most accurate type of gauge we sell, these sets are rated Class X. The class is based on ASME standard B89.1.5, which states their diameter won’t vary more than 0.00004”. This ensures accurate measurements when checking finished parts. Each set includes a manufacturer's certificate of accuracy to certify the diameters are within tolerance.

All sets come in a case to keep them organized and protected.

If a go gauge can enter the hole and a no-go gauge is unable to enter, the hole is within tolerance.

Go Gauges—Go gauges check the minimum hole diameter.

No-Go Gauges—No-go gauges check the maximum hole diameter.

Tool Steel—Made of tool steel, these gauges are strong and hard, so they won’t wear down easily.

									Go Gauges			No-Go Gauges
	Plug Gauge Size	Increment	No. of Pieces	Lg.	Surface Smoothness, RMS, μin	Hardness	Material	Specs. Met	Plug Gauge Size Tolerance		Each	Plug Gauge Size Tolerance		Each
Class X Gauge



		0.0156"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	2149A111	0000000	-0.00004" to 0"	2149A511	0000000


		0.0312"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	2149A112	000000	-0.00004" to 0"	2149A512	000000
		0.0469"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	—	———	0	-0.00004" to 0"	2149A513	000000
		0.0625"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	2149A131	000000	-0.00004" to 0"	2149A531	000000
		0.0781"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	2149A132	000000	-0.00004" to 0"	2149A532	000000
		0.0937"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	2149A133	000000	-0.00004" to 0"	2149A533	000000
		0.1094"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	2149A134	000000	-0.00004" to 0"	2149A534	000000
		0.1250"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	2149A135	000000	-0.00004" to 0"	2149A535	000000
		0.1406"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	—	———	0	-0.00004" to 0"	2149A536	000000
		0.1562"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	2149A137	000000	-0.00004" to 0"	2149A537	000000
		0.1719"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	2149A138	000000	-0.00004" to 0"	2149A538	000000


		0.1875"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	2149A139	000000	-0.00004" to 0"	2149A539	000000
		0.2031"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	2149A141	000000	-0.00004" to 0"	2149A541	000000
		0.2187"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	2149A142	000000	-0.00004" to 0"	2149A542	000000
		0.2344"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	2149A143	000000	-0.00004" to 0"	2149A543	000000
		0.2500"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	2149A144	000000	-0.00004" to 0"	2149A544	000000
		0.2656"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	2149A151	000000	-0.00004" to 0"	2149A551	000000
		0.2812"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	2149A152	000000	-0.00004" to 0"	2149A552	000000
		0.2969"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	—	———	0	-0.00004" to 0"	2149A553	000000
		0.3125"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	2149A154	000000	-0.00004" to 0"	2149A554	000000
		0.3281"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	—	———	0	-0.00004" to 0"	2149A555	000000


		0.3437"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	—	———	0	-0.00004" to 0"	2149A556	000000
		0.3594"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	—	———	0	-0.00004" to 0"	2149A557	000000
		0.3750"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	2149A158	000000	-0.00004" to 0"	2149A558	000000
		0.3906"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	2149A159	000000	-0.00004" to 0"	2149A559	000000
		0.4062"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	—	———	0	-0.00004" to 0"	2149A561	000000
		0.4219"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	2149A162	000000	-0.00004" to 0"	2149A562	000000
		0.4375"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	2149A163	000000	-0.00004" to 0"	2149A563	000000
		0.4531"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	—	———	0	-0.00004" to 0"	2149A564	000000
		0.4687"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	—	———	0	-0.00004" to 0"	2149A565	000000
		0.4844"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	—	———	0	-0.00004" to 0"	2149A566	000000


		0.5000"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	2149A167	000000	-0.00004" to 0"	2149A567	000000
		0.5156"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	—	———	0	-0.00004" to 0"	2149A571	000000
		0.5312"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	2149A172	000000	-0.00004" to 0"	2149A572	000000
		0.5469"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	—	———	0	-0.00004" to 0"	2149A573	000000
		0.5625"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	—	———	0	-0.00004" to 0"	2149A574	000000
		0.5781"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	—	———	0	-0.00004" to 0"	2149A575	000000
		0.5937"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	—	———	0	-0.00004" to 0"	2149A576	000000
		0.6250"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	2149A178	000000	—	———	0
		0.6562"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	2149A181	000000	—	———	0
		0.6719"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	2149A182	000000	—	———	0


		0.7500"	0.0001"	25	2"	2	Rockwell C60	Tool Steel	ASME B89.1.5	0" to 0.00004"	2149A191	000000	—	———	0

Go/No-Go Hex Plug Gauges with Handle

Confirm hex drives on socket head screws are within tolerance. A go and no-go gauge in one, these gauges are handy for testing hole size and depth in machining and manufacturing. Their handle gives you a good grip to insert each end into the hole you’re measuring. If the go gauge enters the hole and the no-go gauge is unable to enter, the hole is within tolerance. Gauges are made of tool steel, the most common material for plug gauges, because it’s strong, hard, and resistant to wear.

All come with an accuracy certificate traceable to NIST to certify their sizes are within tolerance. They also meet ASME B18.3, the same dimensional standards for hex drive fasteners.

	Plug Gauge Size Tolerance
Plug Gauge Size	Go	No-Go	Hardness	Material	End Color	Specs. Met	Features		Each



	0.0280"	0" to 0.0001"	-0.0001" to 0"	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N11	0000000


	0.0350"	0" to 0.0001"	-0.0001" to 0"	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N12	000000
	0.0500"	0" to 0.0001"	-0.0001" to 0"	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N13	000000
	0.0625"	0" to 0.0001"	-0.0001" to 0"	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N14	000000
	0.0781"	0" to 0.0001"	-0.0001" to 0"	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N15	000000
	0.0938"	0" to 0.0001"	-0.0001" to 0"	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N16	000000
	0.1094"	0" to 0.0001"	-0.0001" to 0"	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N17	000000
	0.1250"	0" to 0.0001"	-0.0001" to 0"	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N18	000000
	0.1406"	0" to 0.0001"	-0.0001" to 0"	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N19	000000
	0.1563"	0" to 0.0001"	-0.0001" to 0"	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N21	000000
	0.1875"	0" to 0.0001"	-0.0001" to 0"	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N22	000000


	0.2188"	0" to 0.0001"	-0.0001" to 0"	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N23	000000
	0.2500"	0" to 0.0001"	-0.0001" to 0"	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N24	000000
	0.3125"	0" to 0.0001"	-0.0001" to 0"	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N25	000000
	0.3750"	0" to 0.0001"	-0.0001" to 0"	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N26	000000
	0.4375"	0" to 0.0001"	-0.0001" to 0"	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N27	000000
	0.5000"	0" to 0.0001"	-0.0001" to 0"	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N28	000000
	0.5625"	0" to 0.0001"	-0.0001" to 0"	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N29	000000
	0.6250"	0" to 0.0001"	-0.0001" to 0"	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N31	000000
	0.7500"	0" to 0.0001"	-0.0001" to 0"	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N32	000000
	0.8700"	0" to 0.0001"	-0.0001" to 0"	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N33	000000


	1.0000"	0" to 0.0001"	-0.0001" to 0"	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N34	000000
	1.5 mm	0 mm to 0.003 mm	-0.003 mm to 0 mm	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N35	000000
	2 mm	0 mm to 0.003 mm	-0.003 mm to 0 mm	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N36	000000
	2.5 mm	0 mm to 0.003 mm	-0.003 mm to 0 mm	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N37	000000
	3 mm	0 mm to 0.003 mm	-0.003 mm to 0 mm	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N38	000000
	4 mm	0 mm to 0.003 mm	-0.003 mm to 0 mm	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N39	000000
	5 mm	0 mm to 0.003 mm	-0.003 mm to 0 mm	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N41	000000
	6 mm	0 mm to 0.003 mm	-0.003 mm to 0 mm	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N42	000000
	8 mm	0 mm to 0.003 mm	-0.003 mm to 0 mm	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N43	000000
	10 mm	0 mm to 0.003 mm	-0.003 mm to 0 mm	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N44	000000


	12 mm	0 mm to 0.003 mm	-0.003 mm to 0 mm	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N45	000000
	14 mm	0 mm to 0.003 mm	-0.003 mm to 0 mm	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N46	000000
	17 mm	0 mm to 0.003 mm	-0.003 mm to 0 mm	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N47	000000
	19 mm	0 mm to 0.003 mm	-0.003 mm to 0 mm	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N48	000000
	22 mm	0 mm to 0.003 mm	-0.003 mm to 0 mm	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N49	000000
	24 mm	0 mm to 0.003 mm	-0.003 mm to 0 mm	Rockwell C60	Tool Steel	Green, Red	ASME B18.3	Handle	8178N51	000000

Threaded Plug Gauges

Test if internal threads fall within tolerance. These plug gauges are often used in nuts and tapped holes to confirm thread fit. For precision and accuracy, they’re manufactured to tight tolerances.

Threads are within tolerance if it’s easy to thread a go gauge but difficult to thread a no-go gauge more than two turns.

Class X Gauge

Go Gauge—Go gauges check the minimum hole diameter.

No-Go Gauge—No-go gauges check the maximum hole diameter.

For Class 2B Unified Standard Thread Fit—For inch threads, the higher the class number, the tighter the fit. Unified Standard Class 2B is standard and works for most applications.

For Metric Class 6H Thread Fit—For metric threads, the higher the class number, the looser the fit. Class 6H is the metric standard and works for most applications.

For Thread Fit—Thread fit designates the tightness or looseness of mating threads.

	Thread Size	Thread Type	Pitch Dia. Tolerance	Hardness	Material	For Thread Fit		Each
Go Gauges



		0-80	UNF	0" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N11	000000


		2-56	UNC	0" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N12	00000
		4-40	UNC	0" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N13	00000
		6-32	UNC	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N14	00000
		8-32	UNC	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N15	00000
		10-24	UNC	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N16	00000
		10-32	UNF	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N17	00000
		1/4"-20	UNC	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N18	00000
		1/4"-28	UNF	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N19	00000
		5/16"-18	UNC	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N21	00000
		5/16"-24	UNF	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N22	00000


		3/8"-16	UNC	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N23	00000
		3/8"-24	UNF	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N24	00000
		7/16"-20	UNF	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N25	00000
		1/2"-13	UNC	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N26	00000
		1/2"-20	UNF	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N27	00000
		9/16"-18	UNF	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N28	00000
		5/8"-11	UNC	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N29	00000
		5/8"-18	UNF	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N31	00000
		3/4"-10	UNC	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N32	00000
		3/4"-16	UNF	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N33	00000


		M2 × 0.4 mm	Metric	0" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N34	00000
		M3 × 0.5 mm	Metric	0" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N35	00000
		M4 × 0.7 mm	Metric	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N36	00000
		M5 × 0.8 mm	Metric	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N37	00000
		M6 × 1 mm	Metric	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N38	00000
		M8 × 1 mm	Metric	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N39	00000
		M8 × 1.25 mm	Metric	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N41	00000
		M10 × 1.5 mm	Metric	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N42	00000
		M12 × 1.75 mm	Metric	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N43	00000


		Go Gauges with Accuracy Certificate Traceable to NIST



				0-80	UNF	0" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N101	00000


				2-56	UNC	0" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N102	00000
				4-40	UNC	0" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N103	00000
				6-32	UNC	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N104	00000
				8-32	UNC	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N105	00000
				10-24	UNC	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N106	00000
				10-32	UNF	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N107	00000
				1/4"-20	UNC	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N108	00000
				1/4"-28	UNF	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N109	00000
				5/16"-18	UNC	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N111	00000
				5/16"-24	UNF	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N112	00000


				3/8"-16	UNC	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N113	00000
				3/8"-24	UNF	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N114	00000
				7/16"-20	UNF	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N115	00000
				1/2"-13	UNC	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N116	00000
1/2"-20				UNF	0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N117	00000
9/16"-18	UNF			0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N118	00000
5/8"-11	UNC			0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N119	00000
5/8"-18	UNF			0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N121	00000
3/4"-10	UNC			0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N122	00000
3/4"-16	UNF			0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B, Unified Standard Class 3B	7968N123	00000


M2 × 0.4 mm	Metric			0" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N124	00000
M3 × 0.5 mm	Metric			0" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N125	00000
M4 × 0.7 mm	Metric			0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N126	000000
M5 × 0.8 mm	Metric			0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N127	00000
M6 × 1 mm	Metric			0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N128	00000
M8 × 1 mm	Metric			0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N129	00000
M8 × 1.25 mm	Metric			0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N131	00000
M10 × 1.5 mm	Metric			0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N132	00000
M12 × 1.75 mm	Metric			0" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N133	00000


No-Go Gauges



				0-80	UNF	-0.0002" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N44	00000


				0-80	UNF	-0.0002" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 3B	7968N45	00000
				2-56	UNC	-0.0002" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N46	00000
				4-40	UNC	-0.0002" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N47	00000
				6-32	UNC	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N48	00000
				8-32	UNC	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N49	00000
				10-24	UNC	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N51	00000
				10-32	UNF	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N52	00000
				10-32	UNF	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 3B	7968N53	00000
				1/4"-20	UNC	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N54	00000
				1/4"-28	UNF	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N55	00000


				1/4"-28	UNF	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 3B	7968N56	00000
				5/16"-18	UNC	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N57	00000
				5/16"-24	UNF	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N58	00000
				5/16"-24	UNF	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 3B	7968N59	00000
				3/8"-16	UNC	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N61	00000
		3/8"-24		UNF	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N62	00000
		3/8"-24	UNF	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 3B	7968N63	00000
		7/16"-20	UNF	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N64	00000
		7/16"-20	UNF	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 3B	7968N65	00000
		1/2"-13	UNC	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N66	00000


		1/2"-20	UNF	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N67	00000
		1/2"-20	UNF	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 3B	7968N68	00000
		9/16"-18	UNF	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N69	00000
		9/16"-18	UNF	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 3B	7968N71	00000
		5/8"-11	UNC	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N72	00000
		5/8"-18	UNF	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N73	00000
		5/8"-18	UNF	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 3B	7968N74	00000
		3/4"-10	UNC	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N75	00000
		3/4"-16	UNF	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N76	00000
		3/4"-16	UNF	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 3B	7968N77	00000


		M2 × 0.4 mm	Metric	-0.0002" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N78	00000
		M3 × 0.5 mm	Metric	-0.0002" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N79	00000
		M4 × 0.7 mm	Metric	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N81	00000
		M5 × 0.8 mm	Metric	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N82	00000
		M6 × 1 mm	Metric	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N83	00000
		M8 × 1 mm	Metric	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N84	00000
		M8 × 1.25 mm	Metric	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N85	00000
		M10 × 1.5 mm	Metric	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N86	00000
		M12 × 1.75 mm	Metric	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N87	00000


		No-Go Gauges with Accuracy Certificate Traceable to NIST



				0-80	UNF	-0.0002" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N134	00000


				0-80	UNF	-0.0002" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 3B	7968N135	00000
				2-56	UNC	-0.0002" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N136	00000
				4-40	UNC	-0.0002" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N137	00000
				6-32	UNC	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N138	00000
8-32				UNC	-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N139	00000
10-24	UNC			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N141	00000
10-32	UNF			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N142	00000
10-32	UNF			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 3B	7968N143	00000
1/4"-20	UNC			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N144	00000
1/4"-28	UNF			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N145	00000


1/4"-28	UNF			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 3B	7968N146	00000
5/16"-18	UNC			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N147	00000
5/16"-24	UNF			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N148	00000
5/16"-24	UNF			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 3B	7968N149	00000
3/8"-16	UNC			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N151	00000
3/8"-24	UNF			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N152	00000
3/8"-24	UNF			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 3B	7968N153	00000
7/16"-20	UNF			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N154	00000
7/16"-20	UNF			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 3B	7968N155	00000
1/2"-13	UNC			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N156	00000


1/2"-20	UNF			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N157	00000
1/2"-20	UNF			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 3B	7968N158	00000
9/16"-18	UNF			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N159	00000
9/16"-18	UNF			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 3B	7968N161	00000
5/8"-11	UNC			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N162	00000
5/8"-18	UNF			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N163	00000
5/8"-18	UNF			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 3B	7968N164	00000
3/4"-10	UNC			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N165	00000
3/4"-16	UNF			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 2B	7968N166	00000
3/4"-16	UNF			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Unified Standard Class 3B	7968N167	00000


M2 × 0.4 mm	Metric			-0.0002" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N168	00000
M3 × 0.5 mm	Metric			-0.0002" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N169	00000
M4 × 0.7 mm	Metric			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N171	000000
M5 × 0.8 mm	Metric			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N172	00000
M6 × 1 mm	Metric			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N173	00000
M8 × 1 mm	Metric			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N174	00000
M8 × 1.25 mm	Metric			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N175	00000
M10 × 1.5 mm	Metric			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N176	00000
M12 × 1.75 mm	Metric			-0.0003" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N177	00000

Ball-End Plug Gauges with Handle

Check the true diameter of holes, even if they’re bent or curved. The thin stem on these gauges flexes to reach features deep inside holes and cavities. Unlike standard plug gauges, these gauges have a ball end that centers itself in holes for accurate tolerance tests. They’re often used to inspect bearings and parts made with CNC or milling machines. If the ball passes through the hole, you know the diameter is at least as big as the ball. The handle makes it easier to reach holes that are deep or hard to get to compared to using gauge balls without a handle.

				Stem
	Plug Gauge Size	Plug Gauge Size Tolerance	Handle Lg.	Dia.	Lg.	Surface Smoothness, RMS, μin	Hardness	Material	Features		Each



		0.0110"	-0.0001" to 0.0001"	1 29/32"	0.009"	3"	2	Rockwell C60	Tool Steel	Handle	6803N11	0000000


		0.0120"	-0.0001" to 0.0001"	1 29/32"	0.009"	3"	2	Rockwell C60	Tool Steel	Handle	6803N12	000000
		0.0130"	-0.0001" to 0.0001"	1 29/32"	0.009"	3"	2	Rockwell C60	Tool Steel	Handle	6803N13	000000
		0.0140"	-0.0001" to 0.0001"	1 29/32"	0.009"	3"	2	Rockwell C60	Tool Steel	Handle	6803N14	000000
		0.0150"	-0.0001" to 0.0001"	1 29/32"	0.013"	3"	2	Rockwell C60	Tool Steel	Handle	6803N15	000000
		0.0160"	-0.0001" to 0.0001"	1 29/32"	0.013"	3"	2	Rockwell C60	Tool Steel	Handle	6803N16	000000
		0.0170"	-0.0001" to 0.0001"	1 29/32"	0.013"	3"	2	Rockwell C60	Tool Steel	Handle	6803N17	000000
		0.0180"	-0.0001" to 0.0001"	1 29/32"	0.013"	3"	2	Rockwell C60	Tool Steel	Handle	6803N18	000000
		0.0190"	-0.0001" to 0.0001"	1 29/32"	0.013"	3"	2	Rockwell C60	Tool Steel	Handle	6803N19	000000
		0.0200"	-0.0001" to 0.0001"	1 29/32"	0.013"	3"	2	Rockwell C60	Tool Steel	Handle	6803N21	000000
		0.0210"	-0.0001" to 0.0001"	1 29/32"	0.013"	3"	2	Rockwell C60	Tool Steel	Handle	6803N22	000000


		0.0220"	-0.0001" to 0.0001"	1 29/32"	0.013"	3"	2	Rockwell C60	Tool Steel	Handle	6803N23	000000
		0.0250"	-0.0001" to 0.0001"	1 29/32"	0.018"	3"	2	Rockwell C60	Tool Steel	Handle	6803N24	000000
		0.0270"	-0.0001" to 0.0001"	1 29/32"	0.018"	3"	2	Rockwell C60	Tool Steel	Handle	6803N25	000000
		0.0280"	-0.0001" to 0.0001"	1 29/32"	0.018"	3"	2	Rockwell C60	Tool Steel	Handle	6803N26	000000
		0.0290"	-0.0001" to 0.0001"	1 29/32"	0.018"	3"	2	Rockwell C60	Tool Steel	Handle	6803N27	000000
		0.0300"	-0.0001" to 0.0001"	1 29/32"	0.022"	3"	2	Rockwell C60	Tool Steel	Handle	6803N28	000000
		0.0310"	-0.0001" to 0.0001"	1 29/32"	0.022"	3"	2	Rockwell C60	Tool Steel	Handle	6803N29	000000
		0.0320"	-0.0001" to 0.0001"	1 29/32"	0.022"	3"	2	Rockwell C60	Tool Steel	Handle	6803N31	000000
		0.0350"	-0.0001" to 0.0001"	1 29/32"	0.022"	3"	2	Rockwell C60	Tool Steel	Handle	6803N32	000000
		0.0380"	-0.0001" to 0.0001"	1 29/32"	0.022"	3"	2	Rockwell C60	Tool Steel	Handle	6803N33	000000


		0.0390"	-0.0001" to 0.0001"	1 29/32"	0.022"	3"	2	Rockwell C60	Tool Steel	Handle	6803N34	000000
		0.0400"	-0.0001" to 0.0001"	1 29/32"	0.025"	3"	2	Rockwell C60	Tool Steel	Handle	6803N35	000000
		0.0500"	-0.0001" to 0.0001"	1 29/32"	0.032"	3"	2	Rockwell C60	Tool Steel	Handle	6803N36	00000
		0.0600"	-0.0001" to 0.0001"	1 29/32"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N37	000000
		0.0610"	-0.0001" to 0.0001"	1 29/32"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N38	000000
		0.0620"	-0.0001" to 0.0001"	1 29/32"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N39	000000
		0.0625"	-0.0001" to 0.0001"	1 29/32"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N41	000000
		0.0630"	-0.0001" to 0.0001"	1 29/32"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N42	000000
		0.0640"	-0.0001" to 0.0001"	1 29/32"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N43	000000
		0.0650"	-0.0001" to 0.0001"	1 29/32"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N44	000000


		0.0700"	-0.0001" to 0.0001"	1 29/32"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N45	000000
		0.0780"	-0.0001" to 0.0001"	2 15/32"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N46	000000
		0.0800"	-0.0001" to 0.0001"	2 15/32"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N47	000000
		0.0900"	-0.0001" to 0.0001"	2 15/32"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N48	000000
		0.0930"	-0.0001" to 0.0001"	2 15/32"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N49	000000
		0.0940"	-0.0001" to 0.0001"	2 15/32"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N51	000000
		0.0950"	-0.0001" to 0.0001"	2 15/32"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N52	000000
		0.0960"	-0.0001" to 0.0001"	2 15/32"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N53	000000
		0.0980"	-0.0001" to 0.0001"	2 15/32"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N54	000000
		0.1000"	-0.0001" to 0.0001"	2 15/32"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N55	000000


		0.1180"	-0.0001" to 0.0001"	2 15/32"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N56	000000
		0.1200"	-0.0001" to 0.0001"	2 15/32"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N57	000000
		0.1240"	-0.0001" to 0.0001"	2 15/32"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N58	000000
		0.1250"	-0.0001" to 0.0001"	2 15/32"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N59	000000
		0.1260"	-0.0001" to 0.0001"	2 15/32"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N61	000000
		0.1570"	-0.0001" to 0.0001"	2 15/32"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N62	000000
		0.1870"	-0.0001" to 0.0001"	3 1/8"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N63	000000
		0.1880"	-0.0001" to 0.0001"	3 1/8"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N64	000000
		0.1900"	-0.0001" to 0.0001"	3 1/8"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N65	000000
		0.2490"	-0.0001" to 0.0001"	3 1/8"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N66	000000

0.2500"	-0.0001" to 0.0001"	3 1/8"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N67	000000
0.2510"	-0.0001" to 0.0001"	3 1/8"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N68	000000
0.2520"	-0.0001" to 0.0001"	3 1/8"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N69	000000
0.3750"	-0.0001" to 0.0001"	3 19/32"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N71	000000
0.5000"	-0.0001" to 0.0001"	4 3/16"	0.042"	3"	2	Rockwell C60	Tool Steel	Handle	6803N72	000000

Go/No-Go Left-Hand Threaded Plug Gauges with Handle

A go and no-go gauge in one, these gauges check that left-hand threads fall within tolerance. Use them to confirm thread fit for nuts, tapped holes, and other parts. The taperlock handle speeds up tests, giving you a good grip to thread and unthread each gauge end. It also lets you swap out worn gauges for new ones (not included) on either end.

The go gauge checks the minimum internal thread size, and the no-go gauge checks the maximum. A part is within tolerance if it’s easy to thread the go gauge but difficult to thread the no-go gauge more than two turns.

Class X Gauge

Plug Gauges with Accuracy Certificate Traceable to NIST—Gauges with an accuracy certificate traceable to NIST include verification from the manufacturer that their thread sizes are within tolerance. The certificate is also known as a certificate of compliance or a short-form certification.

For Class 2B Unified Standard Thread Fit—For inch threads, the higher the class number, the tighter the fit. Unified Standard Class 2B is standard and works for most applications.

For Metric Class 6H Thread Fit—For metric threads, the higher the class number, the looser the fit. Class 6H is the metric standard and works for most applications.

For Thread Fit—Thread fit designates the tightness or looseness of mating threads.

	Thread Size	Thread Type	Pitch Dia. Tolerance	Hardness	Material	Features	Choose a Thread Fit		Each
Plug Gauges with Accuracy Certificate Traceable to NIST



		6-32	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7935N31	0000000


		8-32	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7935N32	000000
		10-24	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7935N33	000000
		10-32	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	7935N101	000000
		1/4"-20	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7935N34	000000
		1/4"-28	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	7935N102	000000
		5/16"-18	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7935N35	000000
		5/16"-24	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	7935N103	000000
		3/8"-16	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7935N36	000000
		3/8"-24	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	7935N104	000000
		7/16"-20	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	7935N105	000000


		1/2"-13	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7935N37	000000
		1/2"-20	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	7935N106	000000
		5/8"-11	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7935N38	000000
		5/8"-18	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	7935N107	000000
		3/4"-10	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7935N39	000000
		3/4"-16	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	7935N108	000000
		1"-8	UNC	-0.0004" to 0.0004"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7935N41	000000
		1 1/4"-12	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	7935N109	000000
		M5 × 0.8 mm	Metric	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	7935N42	000000
		M6 × 1 mm	Metric	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	7935N43	000000


		M8 × 1.25 mm	Metric	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	7935N44	000000
		M10 × 1.25 mm	Metric	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	7935N45	000000
		M10 × 1.5 mm	Metric	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	7935N46	000000
		M12 × 1.25 mm	Metric	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	7935N47	000000
		M12 × 1.75 mm	Metric	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	7935N48	000000
		M14 × 1.5 mm	Metric	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	7935N49	000000
		M16 × 1.5 mm	Metric	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	7935N51	000000
		M16 × 2 mm	Metric	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	7935N52	000000


		Plug Gauges with Calibration Certificate Traceable to NIST



				6-32	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7938N31	000000


				8-32	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7938N32	000000
				10-24	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7938N33	000000
				10-32	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	7938N101	000000
				1/4"-20	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7938N34	000000
				1/4"-28	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	7938N102	000000
				5/16"-18	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7938N35	000000
				5/16"-24	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	7938N103	000000
				3/8"-16	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7938N36	000000
				3/8"-24	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	7938N104	000000
				7/16"-20	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	7938N105	000000


				1/2"-13	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7938N37	000000
				1/2"-20	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	7938N106	000000
				5/8"-11	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7938N38	000000
				5/8"-18	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	7938N107	000000
				3/4"-10	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7938N39	000000
3/4"-16				UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	7938N108	000000
1"-8	UNC			-0.0004" to 0.0004"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7938N41	000000
1 1/4"-12	UNF			-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B, Unified Standard Class 3B	7938N109	000000
M5 × 0.8 mm	Metric			-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	7938N42	000000
M6 × 1 mm	Metric			-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	7938N43	000000


M8 × 1.25 mm	Metric			-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	7938N44	000000
M10 × 1.25 mm	Metric			-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	7938N45	000000
M10 × 1.5 mm	Metric			-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	7938N46	000000
M12 × 1.25 mm	Metric			-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	7938N47	000000
M12 × 1.75 mm	Metric			-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	7938N48	000000
M14 × 1.5 mm	Metric			-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	7938N49	000000
M16 × 1.5 mm	Metric			-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	7938N51	000000
M16 × 2 mm	Metric			-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	7938N52	000000

Go/No-Go Helical Insert Threaded Plug Gauges with Handle

Check that holes tapped for helical threads are within tolerance. You’ll sometimes hear these threads referred to as Screw Thread Insert (STI) threads. To speed up tests, these gauges have a go gauge on one end and a no-go gauge on the other. The double-ended taperlock handle makes them quick to thread and unthread. It also lets you swap in new plug gauges (not included) in place of worn ones.

								Plug Gauges with Accuracy Certificate Traceable to NIST		Plug Gauges with Calibration Certificate Traceable to NIST
	Thread Size	Thread Type	Pitch Dia. Tolerance	Hardness	Material	Features	For Thread Fit		Each		Each
Class X Gauge



		2-56	UNC	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7941N11	0000000	7941N28	0000000


		4-40	UNC	-0.0002" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7941N12	000000	7941N29	000000
		6-32	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7941N13	000000	7941N31	000000
		8-32	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7941N14	000000	7941N32	000000
		10-24	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7941N15	000000	7941N33	000000
		10-32	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7941N16	000000	7941N34	000000
		1/4"-20	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7941N17	000000	7941N35	000000
		1/4"-28	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7941N18	000000	7941N36	000000
		5/16"-18	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7941N19	000000	7941N37	000000
		5/16"-24	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7941N21	000000	7941N38	000000
		3/8"-16	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7941N22	000000	7941N39	000000


		3/8"-24	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7941N23	000000	7941N41	000000
		1/2"-13	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7941N24	000000	7941N42	000000
		1/2"-20	UNF	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7941N25	000000	7941N43	000000
		5/8"-11	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7941N26	000000	7941N44	000000
		3/4"-10	UNC	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Unified Standard Class 2B	7941N27	000000	7941N45	000000

Acme Threaded Plug Gauges with Handle

Determine if lead nuts, screw collars, and other parts with internal Acme threads are within tolerance. These gauges are attached to a handle to help you quickly thread or unthread them. All are precisely manufactured to tight tolerances. Instead of replacing the whole tool when a gauge wears down, you can insert a new gauge (not included) into the handle.

A part is within tolerance if it’s easy to thread the go gauge into the part but difficult to thread the no-go gauge more than two turns.

Go Gauges—Go gauges check the minimum hole diameter.

No-Go Gauges—No-go gauges check the maximum hole diameter.

For Thread Fit—Thread fit designates the tightness or looseness of mating threads. Acme Class 2G is standard for Acme threads.

						Go Gauges			No-Go Gauges
	Thread Size	Hardness	Material	Features	For Thread Fit	Pitch Dia. Tolerance		Each	Pitch Dia. Tolerance		Each
Class X Gauge



		1/4"-16	Rockwell C60	Tool Steel	Taperlock Handle	Acme Class 2G	0" to 0.0003"	23565A341	0000000	-0.0003" to 0"	23565A352	0000000


		3/8"-12	Rockwell C60	Tool Steel	Taperlock Handle	Acme Class 2G	0" to 0.0003"	23565A342	000000	-0.0003" to 0"	23565A353	000000
		1/2"-10	Rockwell C60	Tool Steel	Taperlock Handle	Acme Class 2G	0" to 0.0004"	23565A343	000000	-0.0004" to 0"	23565A354	000000
		5/8"-8	Rockwell C60	Tool Steel	Taperlock Handle	Acme Class 2G	0" to 0.0004"	23565A344	000000	-0.0004" to 0"	23565A355	000000
		3/4"-5	Rockwell C60	Tool Steel	Taperlock Handle	Acme Class 2G	0" to 0.0004"	23565A345	000000	-0.0004" to 0"	23565A356	000000
		3/4"-6	Rockwell C60	Tool Steel	Taperlock Handle	Acme Class 2G	0" to 0.0004"	23565A346	000000	-0.0004" to 0"	23565A357	000000
		1"-4	Rockwell C60	Tool Steel	Taperlock Handle	Acme Class 2G	0" to 0.0004"	23565A347	000000	-0.0004" to 0"	23565A358	000000
		1"-5	Rockwell C60	Tool Steel	Taperlock Handle	Acme Class 2G	0" to 0.0004"	23565A348	000000	-0.0004" to 0"	23565A359	000000
		1"-10	Rockwell C60	Tool Steel	Taperlock Handle	Acme Class 2G	0" to 0.0004"	23565A349	000000	-0.0004" to 0"	23565A361	000000
		1 1/4"-5	Rockwell C60	Tool Steel	Taperlock Handle	Acme Class 2G	0" to 0.0004"	23565A351	000000	-0.0004" to 0"	23565A362	000000