Welcome to my Thread Talks #1: NPT vs NPTF
National Pipe Taper (NPT) and National Pipe Taper Fuel (NPTF) are remarkably similar: both have the same taper and threads per inch, and the pitch diameter is the same. The difference is in the root and crest of the threads. NPT thread crest parameters encapsulate NPTF thread crests, even though the NPTF crests have a…