Metric Ring Gauges | McMaster-Carr

Filter by

Thread Size

Pitch

Thread Type

Gauge Measurement Type

No-Go

Certificate Type

Accuracy Certificate Traceable to NIST

Calibration Certificate Traceable to NIST

Thread Fit

Thread Direction

Material

DFARS Specialty Metals

Exempt

RoHS

Compliant

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

Yes

Export Control Classification Number (ECCN)

EAR99

REACH

Compliant

Hardness

Rockwell C60

Size-Checking Gauge Class

Forward

How can we improve?

268 Products

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, mm		Each	Pitch Dia. Tolerance, mm		Each
For Class 6g Metric Thread Fit







				Metric Thread

				M1.6 × 0.35 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.005 to 0	3227A111	0000000	0 to 0.005	3227A112	0000000


				M2 × 0.4 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.005 to 0	3227A115	000000	0 to 0.005	3227A116	000000
				M2.2 × 0.45 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.005 to 0	3227A207	000000	0 to 0.005	3227A208	000000
				M2.5 × 0.45 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.005 to 0	3227A117	000000	0 to 0.005	3227A118	000000
				M3 × 0.5 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.005 to 0	3227A121	000000	0 to 0.005	3227A119	000000
				M3.5 × 0.6 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.005 to 0	3227A123	000000	0 to 0.005	3227A122	000000
				M4 × 0.7 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.005 to 0	3227A125	000000	0 to 0.005	3227A124	000000
				M4.5 × 0.75 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A201	000000	0 to 0.008	3227A202	000000
				M5 × 0.5 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.005 to 0	3227A269	000000	0 to 0.005	3227A271	000000
				M5 × 0.8 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A129	000000	0 to 0.008	3227A128	000000
				M6 × 0.75 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A243	000000	0 to 0.008	3227A244	000000


				M6 × 1 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A132	000000	0 to 0.008	3227A131	000000
				M7 × 1 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A134	000000	0 to 0.008	3227A133	000000
				M8 × 0.75 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A261	000000	0 to 0.008	3227A262	000000
				M8 × 1 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A138	000000	0 to 0.008	3227A137	000000
				M8 × 1.25 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A136	000000	0 to 0.008	3227A135	000000
				M9 × 1 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A212	000000	0 to 0.008	3227A213	000000
				M9 × 1.25 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A214	000000	0 to 0.008	3227A215	000000
				M10 × 1 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A203	000000	0 to 0.008	3227A204	000000
				M10 × 1.25 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A143	000000	0 to 0.008	3227A142	000000
				M10 × 1.5 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A141	000000	0 to 0.008	3227A139	000000


				M11 × 1 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A232	000000	0 to 0.008	3227A233	000000
				M11 × 1.5 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A216	000000	0 to 0.008	3227A217	000000
				M12 × 1 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A152	000000	0 to 0.008	3227A151	000000
				M12 × 1.25 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A149	000000	0 to 0.008	3227A148	000000
				M12 × 1.5 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A147	000000	0 to 0.008	3227A146	000000
				M12 × 1.75 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A145	000000	0 to 0.008	3227A144	000000
				M14 × 1 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A234	000000	0 to 0.008	3227A235	000000
				M14 × 1.25 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A227	000000	0 to 0.008	3227A228	000000
				M14 × 1.5 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A154	000000	0 to 0.008	3227A153	000000
				M14 × 2 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A205	000000	0 to 0.008	3227A206	000000


				M16 × 1 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A249	000000	0 to 0.008	3227A251	000000
				M16 × 1.5 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A156	000000	0 to 0.008	3227A155	000000
				M16 × 2 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A158	000000	0 to 0.008	3227A157	000000
				M18 × 1 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A252	000000	0 to 0.008	3227A253	000000
				M18 × 1.5 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A162	000000	0 to 0.008	3227A159	000000
				M18 × 2.5 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A209	000000	0 to 0.008	3227A211	000000
				M20 × 1 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A229	000000	0 to 0.008	3227A231	000000
				M20 × 1.5 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A218	000000	0 to 0.008	3227A219	000000
				M20 × 2.5 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A221	000000	0 to 0.008	3227A222	000000
				M22 × 1.5 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A223	000000	0 to 0.008	3227A224	000000


				M22 × 2.5 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A225	000000	0 to 0.008	3227A226	000000
				M24 × 1.5 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A254	000000	0 to 0.008	3227A255	000000
				M24 × 2 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A245	000000	0 to 0.008	3227A246	000000
				M24 × 3 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A247	000000	0 to 0.008	3227A248	000000
M26 × 1.5 mm				Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A236	000000	0 to 0.008	3227A237	000000
M27 × 2 mm	Right Hand			Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A238	000000	0 to 0.008	3227A239	000000
M27 × 3 mm	Right Hand			Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A241	000000	0 to 0.008	3227A242	000000
M30 × 1.5 mm	Right Hand			Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A256	000000	0 to 0.008	3227A257	000000
M30 × 2 mm	Right Hand			Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A258	000000	0 to 0.008	3227A259	000000
M30 × 3.5 mm	Right Hand	Rockwell C60		Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A276	000000	0 to 0.008	3227A277	000000
M33 × 2 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A263	000000	0 to 0.008	3227A264	000000
M33 × 3.5 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A272	000000	0 to 0.008	3227A273	000000
M35 × 1.5 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A274	000000	0 to 0.008	3227A275	000000
M36 × 1.5 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A265	000000	0 to 0.008	3227A266	000000
M36 × 2 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A267	000000	0 to 0.008	3227A268	000000
M36 × 4 mm	Right Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	3227A278	000000	0 to 0.008	3227A279	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, mm		Each	Pitch Dia. Tolerance, mm		Each
Class X Gauges



		M1.6 × 0.35 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.005 to 0	23575A102	0000000	0 to 0.005	23575A103	0000000


		M2 × 0.4 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.005 to 0	23575A106	000000	0 to 0.005	23575A107	000000
		M2.2 × 0.45 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.005 to 0	23575A201	000000	0 to 0.005	23575A202	000000
		M2.5 × 0.45 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.005 to 0	23575A108	000000	0 to 0.005	23575A109	000000
		M3 × 0.5 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.005 to 0	23575A112	000000	0 to 0.005	23575A111	000000
		M3.5 × 0.6 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.005 to 0	23575A114	000000	0 to 0.005	23575A113	000000
		M4 × 0.7 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.005 to 0	23575A116	000000	0 to 0.005	23575A115	000000
		M4.5 × 0.75 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A203	000000	0 to 0.008	23575A204	000000
		M5 × 0.5 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.005 to 0	23575A205	000000	0 to 0.005	23575A206	000000
		M5 × 0.8 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A12	000000	0 to 0.008	23575A119	000000
		M6 × 0.75 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A207	000000	0 to 0.008	23575A208	000000


		M6 × 1 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A122	000000	0 to 0.008	23575A121	000000
		M7 × 1 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A209	000000	0 to 0.008	23575A211	000000
		M8 × 0.75 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A212	000000	0 to 0.008	23575A213	000000
		M8 × 1 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A13	000000	0 to 0.008	23575A129	000000
		M8 × 1.25 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A128	000000	0 to 0.008	23575A127	000000
		M9 × 1 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A214	000000	0 to 0.008	23575A215	000000
		M9 × 1.25 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A216	000000	0 to 0.008	23575A217	000000
		M10 × 1 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A218	000000	0 to 0.008	23575A219	000000
		M10 × 1.25 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A134	000000	0 to 0.008	23575A133	000000
		M10 × 1.5 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A132	000000	0 to 0.008	23575A131	000000


		M11 × 1 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A221	000000	0 to 0.008	23575A222	000000
		M11 × 1.5 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A223	000000	0 to 0.008	23575A224	000000
		M12 × 1 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A142	000000	0 to 0.008	23575A141	000000
		M12 × 1.25 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A14	000000	0 to 0.008	23575A139	000000
		M12 × 1.5 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A138	000000	0 to 0.008	23575A137	000000
		M12 × 1.75 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A136	000000	0 to 0.008	23575A135	000000
		M14 × 1 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A225	000000	0 to 0.008	23575A226	000000
		M14 × 1.25 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A227	000000	0 to 0.008	23575A228	000000
		M14 × 1.5 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A144	000000	0 to 0.008	23575A143	000000
		M14 × 2 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A229	000000	0 to 0.008	23575A231	000000


		M16 × 1 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A232	000000	0 to 0.008	23575A233	000000
		M16 × 1.5 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A146	000000	0 to 0.008	23575A145	000000
		M16 × 2 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A148	000000	0 to 0.008	23575A147	000000
		M18 × 1 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A234	000000	0 to 0.008	23575A235	000000
		M18 × 1.5 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A152	000000	0 to 0.008	23575A149	000000
		M18 × 2.5 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A236	000000	0 to 0.008	23575A237	000000
		M20 × 1 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A238	000000	0 to 0.008	23575A239	000000
		M20 × 1.5 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A241	000000	0 to 0.008	23575A242	000000
		M20 × 2.5 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A243	000000	0 to 0.008	23575A244	000000
		M22 × 1.5 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A245	000000	0 to 0.008	23575A246	000000


		M22 × 2.5 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A247	000000	0 to 0.008	23575A248	000000
		M24 × 1.5 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A249	000000	0 to 0.008	23575A251	000000
		M24 × 2 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A252	000000	0 to 0.008	23575A253	000000
		M24 × 3 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A254	000000	0 to 0.008	23575A255	000000
		M26 × 1.5 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A256	000000	0 to 0.008	23575A257	000000
		M27 × 2 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A258	000000	0 to 0.008	23575A259	000000
		M27 × 3 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A261	000000	0 to 0.008	23575A262	000000
		M30 × 1.5 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A263	000000	0 to 0.008	23575A264	000000
		M30 × 2 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A265	000000	0 to 0.008	23575A266	000000
		M30 × 3.5 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A267	000000	0 to 0.008	23575A268	000000

M33 × 2 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A269	000000	0 to 0.008	23575A271	000000
M33 × 3.5 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A272	000000	0 to 0.008	23575A273	000000
M35 × 1.5 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A274	000000	0 to 0.008	23575A275	000000
M36 × 1.5 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A276	000000	0 to 0.008	23575A277	000000
M36 × 2 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A278	000000	0 to 0.008	23575A279	000000
M36 × 4 mm	Metric	Rockwell C60	Tool Steel	Right Hand	Metric Class 6g	-0.008 to 0	23575A281	000000	0 to 0.008	23575A282	000000

Left-Hand Threaded Ring Gauges with Calibration Certificate

Calibrated in a lab and backed by a certificate traceable to NIST, these gauges check if left-hand threads fall within tolerance. The certificate, sometimes called a test report and long-form certificate, details the tested measurements. Use these gauges on screws, threaded rods, and other parts with external threads. For faster tests, hold more than one ring gauge with a threaded ring gauge holder.

Your part is within tolerance if it’s easy to thread a go gauge onto it but difficult to thread a no-go gauge more than two turns.

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—Thread fit designates the tightness or looseness of mating threads. For inch threads, the higher the class number, the tighter the fit. These metric-threaded ring gauges are class 6g, which is comparable to the fit of those with unified standard class 2A threads.

						Go Gauge			No-Go Gauge
	Thread Size	Thread Direction	Hardness	Material	Certificate Type	Pitch Dia. Tolerance, mm		Each	Pitch Dia. Tolerance, mm		Each
For Class 6g Metric Thread Fit







				Metric Thread

				M5 × 0.8 mm	Left Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	7836N42	0000000	0 to 0.008	7836N84	0000000


				M6 × 1 mm	Left Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	7836N43	000000	0 to 0.008	7836N85	000000
				M8 × 1.25 mm	Left Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	7836N44	000000	0 to 0.008	7836N86	000000
				M10 × 1.25 mm	Left Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	7836N45	000000	0 to 0.008	7836N87	000000
				M10 × 1.5 mm	Left Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	7836N46	000000	0 to 0.008	7836N88	000000
				M12 × 1.25 mm	Left Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	7836N47	000000	0 to 0.008	7836N89	000000
				M12 × 1.75 mm	Left Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	7836N48	000000	0 to 0.008	7836N91	000000
				M14 × 1.5 mm	Left Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	7836N49	000000	0 to 0.008	7836N92	000000
				M16 × 1.5 mm	Left Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	7836N51	000000	0 to 0.008	7836N93	000000
				M16 × 2 mm	Left Hand	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.008 to 0	7836N52	000000	0 to 0.008	7836N94	000000

Left-Hand Threaded Ring Gauges

Test if the left-hand threads on parts fall within tolerance. These gauges are often used with parts such as screws, bolts, and threaded rods. All 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.

Class X Gauges

Image of Product. Front orientation. Ring Gauges. Left-Hand Threaded Ring Gauges.

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 Direction	Hardness	Material	Certificate Type	Pitch Dia. Tolerance, mm		Each	Pitch Dia. Tolerance, mm		Each
For Class 6g Metric Thread Fit







				Metric Thread

				M5 × 0.8 mm	Left Hand	Rockwell C60	Tool Steel	Accuracy Certificate Traceable to NIST	-0.008 to 0	8399N42	0000000	0 to 0.008	8399N84	0000000


				M6 × 1 mm	Left Hand	Rockwell C60	Tool Steel	Accuracy Certificate Traceable to NIST	-0.008 to 0	8399N43	000000	0 to 0.008	8399N85	000000
				M8 × 1.25 mm	Left Hand	Rockwell C60	Tool Steel	Accuracy Certificate Traceable to NIST	-0.008 to 0	8399N44	000000	0 to 0.008	8399N86	000000
				M10 × 1.25 mm	Left Hand	Rockwell C60	Tool Steel	Accuracy Certificate Traceable to NIST	-0.008 to 0	8399N45	000000	0 to 0.008	8399N87	000000
				M10 × 1.5 mm	Left Hand	Rockwell C60	Tool Steel	Accuracy Certificate Traceable to NIST	-0.008 to 0	8399N46	000000	0 to 0.008	8399N88	000000
				M12 × 1.25 mm	Left Hand	Rockwell C60	Tool Steel	Accuracy Certificate Traceable to NIST	-0.008 to 0	8399N47	000000	0 to 0.008	8399N89	000000
				M12 × 1.75 mm	Left Hand	Rockwell C60	Tool Steel	Accuracy Certificate Traceable to NIST	-0.008 to 0	8399N48	000000	0 to 0.008	8399N91	000000
				M14 × 1.5 mm	Left Hand	Rockwell C60	Tool Steel	Accuracy Certificate Traceable to NIST	-0.008 to 0	8399N49	000000	0 to 0.008	8399N92	000000
				M16 × 1.5 mm	Left Hand	Rockwell C60	Tool Steel	Accuracy Certificate Traceable to NIST	-0.008 to 0	8399N51	000000	0 to 0.008	8399N93	000000
				M16 × 2 mm	Left Hand	Rockwell C60	Tool Steel	Accuracy Certificate Traceable to NIST	-0.008 to 0	8399N52	000000	0 to 0.008	8399N94	000000