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How to select the correct tap class on Roll Taps

【英】困ったときの知恵袋詳細
Roll (Forming) Taps Standard (Screw Threads, Center Holes)
I have a problem using Roll Taps to create good internal threads. When I check the internal threads with a GP-6H gage, I find the gage fits tight and the threads are a little small. Can you please suggest how to select a suitable tolerance class of roll tap?
You can solve your problem by selecting a larger class of Roll Taps.

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