BSPT Thread Gauges | McMaster-Carr

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19 Products

Thread Identifier Sets

Set includes calipers and gauges to identify external and internal threads.

				Container
	For Use With	For Thread Type	For Thread Location	Type	Material	Includes		Each
Inch/Metric







				Steel

				Screws, Bolts, Threaded Rods, Nuts, Pipe	NPT, UNC, UNF, BSPT, BSPP, Metric	External/Internal	Folding Case	Plastic	Caliper, Instruction Book, Two Steel Angle Gauges, Two Steel Gauges	7863K1	000000

Pipe Thread and Thread Pitch Identifiers

In addition to checking NPT and BSPT pipe sizes, use the two included gauges for measuring thread pitch.

For Thread Type	For Pipe Size	For Gender	Wd.	Ht.	Thk.	Thread Size Identifier Material	Thread Pitch Identifier Material	Color		Each



Pipe	BSPT, NPT	1/8, 1/4, 3/8, 1/2, 3/4, 1, 1 1/4, 1 1/2, 2	Female, Male	9"	4 1/4"	1/4"	Plastic	Steel	Blue	5887T1	00000

Grease Fitting Size Identifiers

Take the guesswork out of determining the thread type and size of a grease fitting. Screw the shank of a grease fitting into the labeled holes of these identifiers until you find the one that fits.

	For Thread Size	For Screw Size	For Pipe Size	Wd.	Ht.	Thk.		Each
Inch/Metric







	Aluminum

	Grease Fittings	NPT, SAE-LT, BSW, UNF, BSPT, BSF, Metric	External	3/16"-32, 1/4"-20, 1/4"-26, 1/4"-28, 5/16"-18, 5/16"-22, 5/16"-24, 3/8"-20, 3/8"-24, 1/2"-12, M6 × 0.75 mm, M6 × 1 mm, M8 × 1 mm, M8 × 1.25 mm, M10 × 1 mm, M10 × 1.5 mm	1/8", 1/4"	1/8, 1/4, 3/8	8 1/2"	3"	1/4"	6672N11	000000

Threaded Plug Gauges with Handle for Pipe Threads

BSPT Thread

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.

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.

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
BSPT Thread



		1/8	-0.0002" to 0.0002"	Rockwell C60	Tool Steel	Taperlock Handle	6744N21	0000000	6744N101	0000000


		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

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—BSPT Thread

Use gauges with BSPT threads on their own. If it takes no more than one turn for the gauge to sit flush against the end of your threads, they’re within tolerance.

Pipe Size	Hardness	Material	Pitch Dia. Tolerance	Certificate Type		Each
1/8	Rockwell C60	Tool Steel	-0.0003" to 0.0003"	Calibration Certificate Traceable to NIST	8400N11	0000000
1/4	Rockwell C60	Tool Steel	-0.0003" to 0.0003"	Calibration Certificate Traceable to NIST	8400N12	000000
3/8	Rockwell C60	Tool Steel	-0.0003" to 0.0003"	Calibration Certificate Traceable to NIST	8400N13	000000
1/2	Rockwell C60	Tool Steel	-0.0003" to 0.0003"	Calibration Certificate Traceable to NIST	8400N14	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—BSPT Thread

Use gauges with BSPT threads on their own for tests—if it takes no more than one turn for the gauge to sit flush against the end of the threads, they’re within tolerance.

Pipe Size	Hardness	Material	Pitch Dia. Tolerance		Each
1/8	Rockwell C55	Tool Steel	-0.0003" to 0.0003"	2365A122	0000000
1/4	Rockwell C55	Tool Steel	-0.0003" to 0.0003"	2365A123	000000
3/8	Rockwell C55	Tool Steel	-0.0003" to 0.0003"	2365A124	000000
1/2	Rockwell C55	Tool Steel	-0.0003" to 0.0003"	2365A125	000000