UNS Gauges | McMaster-Carr

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Accuracy Certificate Traceable to NIST

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132 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 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 Class 3B Unified Standard Thread Fit—The tightest fit for inch-sized threads. Unified Standard Class 3B fits completely flush in applications where parts need to stay in place, such as engines and suspension systems.

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

	Thread Type	Pitch Dia. Tolerance	Hardness	Material	Features	Choose a Thread Fit		Each
Go/No-Go Gauges with Accuracy Certificate Traceable to NIST



	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	0000000


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



			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

Threaded Ring Gauges with Calibration Certificate

Not only were these gauges calibrated in a lab, but they also come with a certificate that's traceable to NIST. The certificate, sometimes called a test report and long form certificate, details the tested measurements. They’re for checking a part’s external threads to ensure they fall within tolerance.

A part is within tolerance if it’s easy to thread a go gauge onto the part but difficult to thread a no-go gauge more than two turns. Inspect faster by holding more than one ring gauge with a threaded ring gauge holder.

Class X Gauges

Go Gauge—Go gauges check the maximum external thread size.

No-Go Gauge—No-go gauges check the minimum external thread size.

For Thread Fit—Threads have different classes of fit. Thread fit designates the tightness or looseness of the mating threads. For example, inch threads with a 3A fit have tighter tolerances than threads with a 2A fit.

						Go Gauge			No-Go Gauge
	Thread Size	Thread Direction	Hardness	Material	Certificate Type	Pitch Dia. Tolerance		Each	Pitch Dia. Tolerance		Each
For Class 2A Unified Standard Thread Fit







				UNS Thread

				1"-14	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A463	0000000	0" to 0.0003"	3160A465	0000000


				For Class 3A Unified Standard Thread Fit







								UNS Thread

								1"-14	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	3160A202	000000	0" to 0.0003"	3160A466	000000

Threaded Ring Gauges

Check a part’s external threads to make sure they fall within tolerance. You can use these for bolts, threaded rods, bits, and more. All gauges come with a manufacturer’s certificate of accuracy, also known as a certificate of compliance or a short form certification, that verifies the thread sizes are within tolerance.

The part is within tolerance if it’s easy to thread a go gauge onto, but difficult to thread a no-go gauge more than two turns. Use a threaded ring gauge holder to keep two gauges on hand at once for faster inspection.

Go Gauge—Go gauges check the maximum external thread size.

No-Go Gauge—No-go gauges check the minimum external thread size.

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



		1"-14	UNS	Rockwell C60	Tool Steel	Right Hand	Unified Standard Class 2A	-0.0003" to 0"	2356A572	0000000	0" to 0.0003"	2356A576	0000000


		1"-14	UNS	Rockwell C60	Tool Steel	Right Hand	Unified Standard Class 3A	-0.0003" to 0"	23555A17	000000	0" to 0.0003"	2356A577	000000

Oil-Level Indicators


Female 90° Angle	Male 90° Elbow	Male 90° Elbow with Drain	Male 90° Elbow with Swivel Fitting	Male Straight

Monitor hydraulic fluid or oil level in gear boxes, crank cases, and other reservoirs. These indicators mount from the outside of your tank. The gauge shield, which protects the indicator from impact, rotates 360° for optimal viewing. Use these indicators in nonpressure applications. All have a vent to prevent pressure from building up and causing an inaccurate level to display. You can also unthread the vent and replace it with your own vent, plug, fitting, or sensor.

40-Micron Filter—Indicators with a 40-micron filter keep out particles as small as table salt.

Drain—Indicators with a drain allow you to sample hydraulic fluid from the reservoir.

Swivel Fitting—Indicators with a swivel fitting have a two-piece construction, so they can be quickly disconnected.

	Gauges									Replacement Glass
	Overall Ht.	Window Ht.	Body Wd.	Max. Pressure @ Temp.	Temp. Range, ° F	Window Material	Features		Each		Each
Brass 90° Elbow







				1/8 NPTF Female Thread

				4 11/16"	2 3/4"	7/8"	Not Rated	-40 to 250	Glass	Vent	1201K7	000000	6110T13	00000




						1/8 NPTF Male Thread

						2 3/4"	1 3/8"	1 1/4"	Not Rated	-40 to 250	Glass	Vent	1224K11	00000	6110T11	0000


						2 3/4"	1 3/8"	1 1/2"	Not Rated	-40 to 250	Glass	Swivel Fitting, Vent	1111K11	00000	6110T11	0000
						2 3/4"	1 3/8"	1 3/4"	Not Rated	-40 to 250	Glass	Vent	1142K12	00000	6110T11	0000
						3 1/4"	1 7/8"	1 1/4"	Not Rated	-40 to 250	Glass	Vent	1224K14	00000	6110T12	0000
						3 1/4"	1 7/8"	1 1/2"	Not Rated	-40 to 250	Glass	Swivel Fitting, Vent	1111K14	00000	6110T12	0000
						3 1/4"	1 7/8"	2 7/8"	Not Rated	-40 to 250	Glass	Drain, Vent	1225K14	00000	6110T12	0000
						4 1/4"	2 3/4"	1 1/4"	Not Rated	-40 to 250	Glass	Vent	1224K17	00000	6110T13	0000
						4 1/4"	2 3/4"	1 1/2"	Not Rated	-40 to 250	Glass	Swivel Fitting, Vent	1111K17	00000	6110T13	0000
						4 1/4"	2 3/4"	1 3/4"	Not Rated	-40 to 250	Glass	Vent	1142K24	00000	6110T13	0000
						4 1/4"	2 3/4"	2 7/8"	Not Rated	-40 to 250	Glass	Drain, Vent	1225K17	00000	6110T13	0000




								1/4 NPTF Female Thread

								3 3/16"	1 3/8"	7/8"	Not Rated	-40 to 250	Glass	Vent	1201K2	00000	6110T11	0000


								3 11/16"	1 7/8"	7/8"	Not Rated	-40 to 250	Glass	Vent	1201K5	00000	6110T12	0000
								4 11/16"	2 3/4"	7/8"	Not Rated	-40 to 250	Glass	Vent	1201K8	00000	6110T13	0000
								6 3/16"	4 1/4"	7/8"	Not Rated	-40 to 250	Glass	Vent	1201K11	00000	6110T15	0000
								7 3/16"	5 1/4"	7/8"	Not Rated	-40 to 250	Glass	Vent	1201K12	00000	6110T16	0000




										1/4 NPTF Male Thread

										2 3/4"	1 3/8"	1 1/16"	Not Rated	-40 to 250	Glass	Vent	1224K12	00000	6110T11	0000


										2 3/4"	1 3/8"	1 9/16"	Not Rated	-40 to 250	Glass	Vent	1142K13	00000	6110T11	0000
										2 3/4"	1 3/8"	1 13/16"	Not Rated	-40 to 250	Glass	Swivel Fitting, Vent	1111K12	00000	6110T11	0000
										2 3/4"	1 3/8"	2 11/16"	Not Rated	-40 to 250	Glass	Drain, Vent	1225K12	00000	6110T11	0000
										3 1/4"	1 7/8"	1 1/16"	Not Rated	-40 to 250	Glass	Vent	1224K15	00000	6110T12	0000
										3 1/4"	1 7/8"	1 9/16"	Not Rated	-40 to 250	Glass	Vent	1142K16	00000	6110T12	0000
										3 1/4"	1 7/8"	1 13/16"	Not Rated	-40 to 250	Glass	Swivel Fitting, Vent	1111K15	00000	6110T12	0000
										3 1/4"	1 7/8"	2 11/16"	Not Rated	-40 to 250	Glass	Drain, Vent	1225K15	00000	6110T12	0000
										4 1/4"	2 3/4"	1 1/16"	Not Rated	-40 to 250	Glass	Vent	1224K18	00000	6110T13	0000
										4 1/4"	2 3/4"	1 9/16"	Not Rated	-40 to 250	Glass	Vent	1142K17	00000	6110T13	0000
										4 1/4"	2 3/4"	1 13/16"	Not Rated	-40 to 250	Glass	Swivel Fitting, Vent	1111K18	00000	6110T13	0000


										4 1/4"	2 3/4"	2 11/16"	Not Rated	-40 to 250	Glass	Drain, Vent	1225K18	00000	6110T13	0000
										5 3/4"	4 1/4"	1 1/16"	Not Rated	-40 to 250	Glass	Vent	1224K21	00000	6110T15	0000
5 3/4"										4 1/4"	1 13/16"	Not Rated	-40 to 250	Glass	Swivel Fitting, Vent	1111K22	00000	6110T15	0000
5 3/4"	4 1/4"									2 11/16"	Not Rated	-40 to 250	Glass	Drain, Vent	1225K21	00000	6110T15	0000
8 3/4"	7 1/4"									1 13/16"	Not Rated	-40 to 250	Glass	Swivel Fitting, Vent	1111K24	00000	6110T17	0000




		3/8 NPTF Female Thread

		3 3/16"	1 3/8"							7/8"	Not Rated	-40 to 250	Glass	Vent	1201K3	00000	6110T11	0000


		3 11/16"	1 7/8"							7/8"	Not Rated	-40 to 250	Glass	Vent	1201K6	00000	6110T12	0000
		4 11/16"	2 3/4"	7/8"						Not Rated	-40 to 250	Glass	Vent	1201K9	00000	6110T13	0000
		6 1/4"	4 1/4"	1"	Not Rated					-40 to 250	Glass	Vent	1201K13	00000	6110T18	0000
		9 1/2"	7 1/2"	1"	Not Rated					-40 to 250	Glass	Vent	1201K15	00000	6110T19	0000
		14 1/2"	12 1/2"	1"	Not Rated					-40 to 250	Glass	Vent	1201K17	00000	6110T22	0000




				3/8 NPTF Male Thread

				2 3/4"	1 3/8"					1 1/16"	Not Rated	-40 to 250	Glass	Vent	1224K13	00000	6110T11	0000


				2 3/4"	1 3/8"					1 7/8"	Not Rated	-40 to 250	Glass	Swivel Fitting, Vent	1111K13	00000	6110T11	0000
				2 3/4"	1 3/8"					2 11/16"	Not Rated	-40 to 250	Glass	Drain, Vent	1225K13	00000	6110T11	0000
				3 1/4"	1 7/8"					1 1/16"	Not Rated	-40 to 250	Glass	Vent	1224K16	00000	6110T12	0000
				3 1/4"	1 7/8"					1 9/16"	Not Rated	-40 to 250	Glass	Vent	1142K23	00000	6110T12	0000
				3 1/4"	1 7/8"					1 7/8"	Not Rated	-40 to 250	Glass	Swivel Fitting, Vent	1111K16	00000	6110T12	0000
				3 1/4"	1 7/8"					2 11/16"	Not Rated	-40 to 250	Glass	Drain, Vent	1225K16	00000	6110T12	0000
				4 1/4"	2 3/4"	1 1/16"				Not Rated	-40 to 250	Glass	Vent	1224K19	00000	6110T13	0000
				4 1/4"	2 3/4"	1 9/16"	Not Rated			-40 to 250	Glass	Vent	1142K25	00000	6110T13	0000
				4 1/4"	2 3/4"	1 7/8"	Not Rated			-40 to 250	Glass	Swivel Fitting, Vent	1111K19	00000	6110T13	0000
				4 1/4"	2 3/4"	2 11/16"	Not Rated			-40 to 250	Glass	Drain, Vent	1225K19	00000	6110T13	0000


				4 3/4"	3 1/4"	1 9/16"	Not Rated			-40 to 250	Glass	Vent	1142K18	00000	6110T14	0000
				5 3/4"	4 1/4"	1 9/16"	Not Rated			-40 to 250	Glass	Vent	1142K19	00000	6110T15	0000
				5 7/8"	4 1/4"	1 5/8"	Not Rated			-40 to 250	Glass	Vent	1224K23	00000	6110T18	0000
				5 7/8"	4 1/4"	2 7/16"	Not Rated			-40 to 250	Glass	Swivel Fitting, Vent	1111K25	00000	6110T18	0000
				5 7/8"	4 1/4"	3 3/16"	Not Rated			-40 to 250	Glass	Drain, Vent	1225K23	000000	6110T18	0000
				9 1/8"	7 1/2"	1 5/8"	Not Rated			-40 to 250	Glass	Vent	1224K25	00000	6110T19	0000
				9 1/8"	7 1/2"	2 3/8"	Not Rated			-40 to 250	Glass	Vent	1142K27	00000	6110T19	0000
				9 1/8"	7 1/2"	2 7/16"	Not Rated	-40 to 250		Glass	Swivel Fitting, Vent	1111K27	00000	6110T19	0000
				9 1/8"	7 1/2"	3 3/16"	Not Rated	-40 to 250	Glass	Drain, Vent	1225K25	000000	6110T19	0000
				14 1/8"	12 1/4"	3 3/16"	Not Rated	-40 to 250	Glass	Drain, Vent	1225K27	000000	6110T22	0000


				14 1/8"	12 1/2"	1 5/8"	Not Rated	-40 to 250	Glass	Vent	1224K27	000000	6110T22	0000
				14 1/8"	12 1/2"	2 7/16"	Not Rated	-40 to 250	Glass	Swivel Fitting, Vent	1111K29	000000	6110T22	0000




						1/2 NPTF Female Thread

						6 1/4"	4 1/4"	1"	Not Rated	-40 to 250	Glass	Vent	1201K14	00000	6110T18	0000


						9 1/2"	7 1/2"	1"	Not Rated	-40 to 250	Glass	Vent	1201K16	00000	6110T19	0000
						14 1/2"	12 1/2"	1"	Not Rated	-40 to 250	Glass	Vent	1201K18	00000	6110T22	0000




								1/2 NPTF Male Thread

5 7/8"								4 1/4"	1 7/16"	Not Rated	-40 to 250	Glass	Vent	1224K24	00000	6110T18	0000


5 7/8"	4 1/4"							2 3/16"	Not Rated	-40 to 250	Glass	Vent	1142K21	00000	6110T18	0000
5 7/8"	4 1/4"							2 1/4"	Not Rated	-40 to 250	Glass	Swivel Fitting, Vent	1111K26	00000	6110T18	0000
5 7/8"	4 1/4"							3"	Not Rated	-40 to 250	Glass	Drain, Vent	1225K24	00000	6110T18	0000
9 1/8"	7 1/2"							1 7/16"	Not Rated	-40 to 250	Glass	Vent	1224K26	00000	6110T19	0000
9 1/8"	7 1/2"							2 3/16"	Not Rated	-40 to 250	Glass	Vent	1142K28	00000	6110T19	0000
9 1/8"	7 1/2"							2 1/4"	Not Rated	-40 to 250	Glass	Swivel Fitting, Vent	1111K28	00000	6110T19	0000
9 1/8"	7 1/2"							3"	Not Rated	-40 to 250	Glass	Drain, Vent	1225K26	00000	6110T19	0000
14 1/8"	12 1/4"							3"	Not Rated	-40 to 250	Glass	Drain, Vent	1225K28	000000	6110T22	0000
14 1/8"	12 1/2"							1 7/16"	Not Rated	-40 to 250	Glass	Vent	1224K28	000000	6110T22	0000
14 1/8"	12 1/2"							2 3/16"	Not Rated	-40 to 250	Glass	Vent	1142K31	000000	6110T22	0000


14 1/8"	12 1/2"	2 1/4"	Not Rated					-40 to 250	Glass	Swivel Fitting, Vent	1111K31	000000	6110T22	0000


Brass Straight







								1/8 NPTF Male Thread

								2 5/16"	1 3/8"	—	Not Rated	-40 to 250	Glass	Vent	1141K11	00000	6110T11	0000


								3 5/16"	1 7/8"	—	Not Rated	-40 to 250	Glass	Vent	1141K23	00000	6110T12	0000
								3 13/16"	1 7/8"	—	Not Rated	-40 to 250	Glass	40-Micron Filter, Vent	1281K74	00000	6110T12	0000
								5 13/16"	4 1/4"	—	Not Rated	-40 to 250	Glass	Vent	1141K36	00000	6110T15	0000
								6 5/16"	4 1/4"	—	Not Rated	-40 to 250	Glass	40-Micron Filter, Vent	1281K79	00000	6110T15	0000




										1/4 NPTF Male Thread

										3"	1 3/8"	—	Not Rated	-40 to 250	Glass	Vent	1141K12	00000	6110T11	0000


										3 1/2"	1 3/8"	—	Not Rated	-40 to 250	Glass	40-Micron Filter, Vent	1281K72	00000	6110T11	0000
										3 1/2"	1 7/8"	—	Not Rated	-40 to 250	Glass	Vent	1141K13	00000	6110T12	0000
										4"	1 7/8"	—	Not Rated	-40 to 250	Glass	40-Micron Filter, Vent	1281K75	00000	6110T12	0000
										4 1/2"	2 3/4"	—	Not Rated	-40 to 250	Glass	Vent	1141K14	00000	6110T13	0000
										5"	2 3/4"	—	Not Rated	-40 to 250	Glass	40-Micron Filter, Vent	1281K77	00000	6110T13	0000
										6"	4 1/4"	—	Not Rated	-40 to 250	Glass	Vent	1141K37	00000	6110T15	0000
				6 1/2"						4 1/4"	—	Not Rated	-40 to 250	Glass	40-Micron Filter, Vent	1281K81	00000	6110T15	0000
				9 1/4"	7 1/2"					—	Not Rated	-40 to 250	Glass	Vent	1141K43	00000	6110T19	0000
				9 3/4"	7 1/2"					—	Not Rated	-40 to 250	Glass	40-Micron Filter, Vent	1281K85	00000	6110T19	0000




										3/8 NPTF Male Thread

										3"	1 3/8"	—	Not Rated	-40 to 250	Glass	Vent	1141K31	00000	6110T11	0000


						3 1/2"	1 3/8"			—	Not Rated	-40 to 250	Glass	40-Micron Filter, Vent	1281K73	00000	6110T11	0000
						3 1/2"	1 7/8"			—	Not Rated	-40 to 250	Glass	Vent	1141K32	00000	6110T12	0000
						4"	1 7/8"			—	Not Rated	-40 to 250	Glass	40-Micron Filter, Vent	1281K76	00000	6110T12	0000
						4 1/2"	2 3/4"			—	Not Rated	-40 to 250	Glass	Vent	1141K35	00000	6110T13	0000
						5"	2 3/4"			—	Not Rated	-40 to 250	Glass	40-Micron Filter, Vent	1281K78	00000	6110T13	0000
						6"	4 1/4"			—	Not Rated	-40 to 250	Glass	Vent	1141K16	00000	6110T15	0000
						6 1/2"	4 1/4"			—	Not Rated	-40 to 250	Glass	40-Micron Filter, Vent	1281K82	00000	6110T15	0000
						11 1/4"	9 1/2"			—	Not Rated	-40 to 250	Glass	Vent	1141K45	00000	6110T21	0000
						11 3/4"	9 1/2"			—	Not Rated	-40 to 250	Glass	40-Micron Filter, Vent	1281K87	00000	6110T21	0000
						14 1/4"	12 1/2"			—	Not Rated	-40 to 250	Glass	Vent	1141K47	00000	6110T22	0000


						14 3/4"	12 1/2"			—	Not Rated	-40 to 250	Glass	40-Micron Filter, Vent	1281K89	00000	6110T22	0000




										1/2 NPTF Male Thread

										6 3/16"	4 1/4"	—	Not Rated	-40 to 250	Glass	Vent	1141K17	00000	6110T18	0000


6 11/16"	4 1/4"									—	Not Rated	-40 to 250	Glass	40-Micron Filter, Vent	1281K84	00000	6110T18	0000
9 7/16"	7 1/2"									—	Not Rated	-40 to 250	Glass	Vent	1141K44	00000	6110T19	0000
9 15/16"	7 1/2"									—	Not Rated	-40 to 250	Glass	40-Micron Filter, Vent	1281K86	00000	6110T19	0000
11 7/16"	9 1/2"									—	Not Rated	-40 to 250	Glass	Vent	1141K46	00000	6110T21	0000
11 15/16"	9 1/2"	—								Not Rated	-40 to 250	Glass	40-Micron Filter, Vent	1281K88	00000	6110T21	0000
14 7/16"	12 1/2"	—	Not Rated							-40 to 250	Glass	Vent	1141K48	00000	6110T22	0000
14 15/16"	12 1/2"	—	Not Rated							-40 to 250	Glass	40-Micron Filter, Vent	1281K91	00000	6110T22	0000