The differences between Rp and PS

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

Are the "Rp" and the "PS" parallel pipe internal threads, the same? If not, how are they different? Also, what type of taps should be used for parallel pipe threads? Are there two kinds of parallel pipe threads, "PS" and "Rp"?

There is basically little difference between the internal parallel pipe threads of a "Rp" and a "PS". You might think there is a size change from the "PS" to "Rp" but the difference is so slight, you can use the same tap to produce either a "PS" or a "Rp" parallel pipe thread. The length of the Yamawa parallel pipe "PS taps" and "Rp taps" are different from the length of the components parallel pipe thread but the tap limits are the same, so either the "PS" or a "Rp" parallel pipe tap can be used to create an internal parallel pipe thread.

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