Difference between NPT and NPTF

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Cutting Taps Pipe Threads Standard (Screw Threads, Center Holes)Tool Selection

Previously, I have worked with American pipe taper threads (NPT).This time, I have been asked to tap using American pipe taper threads (NPTF). What is the difference between “NPT” and “NPTF”?

NPT is the American standard for general tapered pipe threads. When sealing is
required, sealants are used to achieve leak tightness. On the other hand, NPTF is the American standard for dryseal tapered pipe threads. It is used in cases where the pipe may become hot and the sealant could melt. With NPTF, leak tightness can be ensured without sealant, thanks to its specially designed thread profile.

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