NPT - Male thread
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NPT male thread American NPT tapered thread ANSI / ASME B1.20.1 - 1983 |
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| D | Lmin | Code | A3 | A7 | A11 | E5 | S15 in |
S15 out |
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| 1/8-27 NPT | 8 | NA 18 |  |
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| 1/4-18 NPT | 12 | NA 14 | |
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| 3/8-18 NPT | 12 | NA 38 | |
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| 1/2-14 NPT | 14 | NA 12 | |
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| 3/4-14 NPT | 16 | NA 34 | |
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| 1-11.5 NPT | 19 | NA 01 | |
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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).