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International Measuring and Identification Guide - BSPT (British Standard Pipe Tapered) - BS 21

Manufactured by Various

Product Group Data
	Male Tapered O.D		Female Tapered I.D.
Thread Size	MM	Frac.	MM	Frac.
1/8 - 28	10.31	13/32	9.5	3/8
1/4 - 19	13.50	17/32	11.91	15/32
3/8 - 19	16.67	21/32	15.08	19/32
1/2 - 14	21.43	17/32	19.84	25/32
5/8 - 14	23.02	29/32	21.43	27/32
3/4 - 14	26.99	1 1/16	24.61	31/32
1 - 11	34.13	1 11/32	31.75	1 1/4
1 1/4 - 11	42.86	1 11/16	40.48	1 19/32
1 1/2 - 11	48.42	1 29/32	46.83	1 27/32
2 - 11	60.33	2 3/8	58.74	2 5/16
The BSPT male and female connections have tapered threads.
BSPT connectors are similar to NPTF but not interchangeable. The seal is made on the threads.
The threads retain the connection.
Note: The BSPT tapered threads are identical to and interchangeable with JIS tapered threads.