Metric Class 6H Plug Gauges

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Unified Standard Class 2B

Unified Standard Class 3B

Certificate Type

Accuracy Certificate Traceable to NIST

Calibration Certificate Traceable to NIST

Thread Direction

Left Hand

Right Hand

Gauge Measurement Type

REACH

RoHS

Material

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Finish

Chrome Plated

DFARS Specialty Metals

Exempt

Hardness

Rockwell C70

Export Control Classification Number (ECCN)

EAR99

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170 Products

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 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	For Thread Fit		Each
Go/No-Go Gauges



		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	0000000


		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



				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



				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

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



	M2 × 0.4 mm	Metric	0" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N34	000000


	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



			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



					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



							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

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.

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.

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



	M5 × 0.8 mm	Metric	-0.0003" to 0.0003"	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	7935N42	0000000


	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



			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