I am trying to find the best way to cut a 1/2-14 NPTF internal thread in 1018 material. I have tried tapping this material with very little luck. The material in very soft and gummy it just wants to tear/smear. We are now using ID thread insert. It gives a nice thread that gages very good. But my insert life is poor. We are getting around 70 to 100 part per corner on our insert. This part is running on an Okuma LT200 running at 1250 RPM. Happy with the thread it makes just would like a little more tool life. Anyone out there had any luck with 1/2-14 NPTF in 1018 material?

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