NPT fittings are sub-divided into female fittings: FPT, FNPT, NPT(F) and male fittings: MPT, MNPT, NPT(M) Some sources refer to NPT as IPT (Iron Pipe Thread). However because of allowances and variations in the precise thread cuts it's necessary to use a sealant such as teflon tape or pipe thread sealant to assure a leak-free connection. NPT threads are cut at cut at an angle of about 60° along the length of the fitting, and the actual individual threads are cut at an angle of about 1° 47’ from the centerline of the fitting.Īs a male and female NPT fitting are tightened against this taper the connection is increasingly tight.
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