What is the difference between NPT and NPTF? - Hose …
Dec 22, 2015 · For the National Pipe Tapered for Fuels, or NPTF, the pipe should be thread as per ANSI B1.20.3. Differences in NPT and NPTF threads lie in the major and minor diameters, as well as the root and crest of the threads. NPTF thread crests call within the same parameters as NPT requirements, but NPTF crests have a smaller range.
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