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Thread: Tap drill sizes

  1. #1
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    Tap drill sizes

    I'm not sure if this is the correct forum or has been discussed in the past. But here is a very simple formula on finding the correct tap drill size.

    tap size-pitch=tap drill
    example 1/4-20 tap is .201 tap drill
    .250-(1/20)=.20
    Gary
    www.astrotoolco.com


  2. #2
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    And this is even easier in metric......M3 x .5 thread, M3 - .5 = 2.5mm tap drill.


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