Pipe Taps: Combination of Internal and External Pipe Threads

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

There are many kinds of pipe threads with various symbols, such as R, Rc, Rp, G, PT, PS, PF. Can you tell me if there are any rules for the combination between internal threads and external threads? I'm having trouble understanding all the different types of the pipe threads.

The combination of internal and external threads is called "engagement". If you use the wrong combination without knowing, serious problems can occur. Please refer to the explanation below. It is even more difficult to understand today because the current JIS standard (ISO compliant standard) and the old JIS standard for internal threads and external threads are the same threads with new symbols.

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