Note that these references are somewhat casual, and might possibly be used in reference to NPS instead of NPT thread. NPS thread (National Pipe Straight) is not interchangeable with NPT thread.

1 1 2 npt threadsize chart

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NPT and NPTF appear to be identical. Both have the same pitch diameter at the top of the hole of the internal thread or end of the pipe on external threads and both have the same thread lengths or depths. However, there is a subtle difference in the root and crest diameters of the threads.NPT threads are also sometimes referred to as: