Difference Between PT And NPT For Pipe Taps - Yamawa

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本文へ YAMAWA MFG. Co., Ltd.>Support & Inquiry>Bag Full of Wisdom when you are in trouble>Difference between PT and NPT for Pipe Taps 【英】困ったときの知恵袋詳細 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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