NPT - Male thread

NA

NPT male thread

American NPT tapered thread ANSI / ASME B1.20.1 - 1983

D Lmin Code A3 A7 A11 E5 S15
in
S15
out
1/8-27 NPT 8 NA 18 OK OK OK OK OK OK
1/4-18 NPT 12 NA 14 OK OK OK OK OK OK
3/8-18 NPT 12 NA 38 OK OK OK OK OK OK
1/2-14 NPT 14 NA 12 OK OK OK OK OK OK
3/4-14 NPT 16 NA 34   OK OK OK OK  
1-11.5 NPT 19 NA 01     OK   OK  

The NPT thread has a tapered form. To ensure a leak-tight seal, the use of a pipe thread sealant is recommended. One commonly utilized technique is Teflon Tape, wich you wrap twice clockwise around the male end. Note that the pipe thread sealant may have lower temperature capabilities than the valve (e.g. Teflon Tape max 450°F).

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