Difference between PT and NPT for Pipe Taps

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

We have a contract to produce a 3/8 NPT internal thread for exporting to the USA. I have a PT 3/8 tap that I always use for tapping pipe threads. Can I use the PT 3/8 tap to make the 3/8 NPT internal threads?

The 3/8 NPT is an American taper pipe thread. It is different from a taper pipe thread PT 3/8 which is normal in Japan. You cannot use the PT 3/8 for making the 3/8 NPT thread. The thread angle and the number of threads per inch are different betwen them. Please refer to the explanation on the attached PDF file for more details.

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