M5x.5 tap drill size? - Page 2
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  1. #21
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    where is Gordon when we need him?

    I have the chart but it is not my call...

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    Use this tap drill calculator. It works for inch/metric and cut/form taps.

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    Quote Originally Posted by Bobw View Post
    Pitch diameter plus a few thou.
    Wait... Is it really that easy for a form tap?

  5. #24
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    Quote Originally Posted by kenton View Post
    Wait... Is it really that easy for a form tap?
    A hole drilled AT the PD will give a 100% thread.

    1/4-28 PD .227-.230 75% thread drill .2318

    1/2-13 PD .450-.455 75% thread drill .460

    3/4-10 PD .685 - .691 75% thread drill .699

    4-40 PD .096 - .098 75% thread drill .0993


    It really is that easy.

    Take the tap size and subtract 1/2 the pitch.
    That works too.

    Edit: That works better.

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    Where is Gordon, he is he thread guy.
    I stepping out of my comfort zone
    http://www.freetechnicalcharts.com/m...Size_Chart.pdf

    Good to pre drill smaller ,then drill the tap drill size..
    Agree I don't know is this chart is for 75% thread or what.

    Thread ref chart
    http://www.professeurs.polymtl.ca/lu...C%20THREAD.pdf

    You can sweep across with your mouse and highlight the thread you are looking at.
    hold down left click

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    All of the aforementioned are good rules of thumb, but it would be wise to invest in a machinery's handbook and learn how to use it.

    The following calculator is useful though, I often use the one for measuring over thread wires when feeling lazy.
    Tap drill size calculators


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