NPT Pipe Thread Gauges | McMaster-Carr

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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.	Thick.	Thread Size Identifier Material	Thread Pitch Identifier Material	Color		Each

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	000000	00000