BSPP Thread Ring Gauges | McMaster-Carr

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Tool Steel

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Calibration Certificate Traceable to NIST

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28 Products

Threaded Ring Gauges for Pipe Threads with Calibration Certificate

These gauges come with a certificate that’s traceable to NIST, confirming they were calibrated in a lab. The certificate, sometimes called a test report or a long-form certificate, includes the tested measurements. Use these gauges to verify whether external pipe threads are within tolerance.

Class X Gauge—BSPP Thread

Use gauges with BSPP threads in pairs for go/no-go tests. Go gauges check the maximum external thread size, and no-go gauges check the minimum. If the threads you’re testing thread into the go gauge but not the no-go gauge, they’re within tolerance.

				Go Gauge			No-Go Gauge
Pipe Size	Hardness	Material	Certificate Type	Pitch Dia. Tolerance		Each	Pitch Dia. Tolerance		Each
1/8	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	8400N15	0000000	0" to 0.0003"	8400N23	0000000
1/4	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	8400N16	000000	0" to 0.0003"	8400N24	000000
3/8	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	8400N17	000000	0" to 0.0003"	8400N25	000000
1/2	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	8400N18	000000	0" to 0.0003"	8400N26	000000
3/4	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	8400N19	000000	0" to 0.0003"	8400N27	000000
1	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	8400N21	000000	0" to 0.0003"	8400N28	000000
1 1/4	Rockwell C60	Tool Steel	Calibration Certificate Traceable to NIST	-0.0003" to 0"	8400N22	000000	0" to 0.0003"	8400N29	000000

Threaded Ring Gauges for Pipe Threads

Confirm that external pipe threads are sized within tolerance. Manufactured with precision, these gauges meet tight thread tolerances themselves.

Class X Gauge—BSPP Thread

Image of Product. Front orientation. Ring Gauges. Threaded Ring Gauges for Pipe Threads.

			Go Gauge			No-Go Gauge
Pipe Size	Hardness	Material	Pitch Dia. Tolerance		Each	Pitch Dia. Tolerance		Each
1/8	Rockwell C55	Tool Steel	0" to 0.0003"	2365A126	0000000	-0.0003" to 0"	2365A134	0000000
1/4	Rockwell C55	Tool Steel	0" to 0.0003"	2365A127	000000	-0.0003" to 0"	2365A135	000000
3/8	Rockwell C55	Tool Steel	0" to 0.0003"	2365A128	000000	-0.0003" to 0"	2365A136	000000
1/2	Rockwell C55	Tool Steel	0" to 0.0003"	2365A129	000000	-0.0003" to 0"	2365A137	000000
3/4	Rockwell C55	Tool Steel	0" to 0.0003"	2365A131	000000	-0.0003" to 0"	2365A138	000000
1	Rockwell C55	Tool Steel	0" to 0.0003"	2365A132	000000	-0.0003" to 0"	2365A139	000000
1 1/4	Rockwell C55	Tool Steel	0" to 0.0003"	2365A133	000000	-0.0003" to 0"	2365A141	000000