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  1. Calbrat

    NPSF Thread Plug Gage cert. check

    I am trying to certify 1/2 - 14 NPSF thread plug gage with a P.D. of .7700 - .7767. Can someone tell me which formula that needs to be used to check this thread size. I have looked into using the NPSM, NPSI and NPSL but there is something different about each one. The Machinist Handbook does not...

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