Definition of NPT and FPT Thread - Hunker
Definition of NPT and FPT Thread. By Jennifer VanBaren. Our Editorial Process. Hunker may earn compensation through affiliate links in this story. NPT, national pipe threads, and FPT, female pipe threads, are terms used regarding U.S. pipe standards for tapered threads. NPT are common threads used for general purposes, while FPT are a type of NPT.
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