NPT - Female thread

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NI

NPT female thread

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

 NI – Technical illustration: NI
D Lmin Code A3 A7 A11 E5 S15
in		 S15
out
1/8-27 NPT 10 NI 18 Available Available Available Available Available Available
1/4-18 NPT 11 NI 14 Available Available Available Available Available Available
3/8-18 NPT 12 NI 38   Available Available Available Available  
1/2-14 NPT 15 NI 12   Available Available Available Available  
3/4-14 NPT 17 NI 34     Available   Available  
1-11.5 NPT 19 NI 01     Available      

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).