International Measuring and Identification Guide - NPTF Pipe Thread SAE J514

MaleNPTFNPSM
ThreadThreadFemaleThreadFemaleThread
SizeO.D.I.D.I.D.
1/8 - 2713/3211/3211/32
1/4 - 189/1615/3215/32
3/8 - 1811/1619/325/8
1/2 - 1427/3223/323/4
3/4 - 141 1/1615/1631/32
1 - 11 1/21 5/161 3/161 7/32
1 1/4 - 11 1/21 11/161 17/321 9/16
1 1/2 - 11 1/21 29/321 3/41 25/32
2 - 11 1/22 3/82 1/42 1/4
The NPTF male and female connection have tapered threads. The seal takes place by deformation of threads.
The NPTF male will mate with NPTF or NPSM female connectors. The threads retain the connection.