Thread: drill size

  1. #1
    I know some one will be able to help

    I would like to know the drill size for tapping the following threads


    thank you for your help

    James & Luke :question::question:

  2. #2
    i2i's Avatar
    Lives in Cardiff, United Kingdom. Last Activity: 3 Weeks Ago Has been a member for 9-10 years. Has a total post count of 694. Received thanks 30 times, giving thanks to others 0 times.
    if you know the pitch of the thread, take it from the diameter.

    thread size - pitch = tapping drill size

    m5 - 0.8 = 4.2
    m6 - 1 = 5
    m8 - 1.25 = 6.75
    m10 - 1.5 = 8.5

  3. #3
    thank you i2i

    drill bits ordered


  4. #4
    Quote Originally Posted by luke11cnc View Post
    thank you i2i

    drill bits ordered

    If I'd noticed your post a bit sooner you could have had a few of mine as I keep plenty of spares for the tapping sizes.

    Also thread diameter-pitch is only a guide ... hard materials will be easier to drill slightly (0.1mm) bigger. Since 6.75 is not standard you'll want 6.8mm or 6.9mm.

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