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Thread: Direction to tap thread?

  1. #1
    Associate Engineer
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    Direction to tap thread?

    I feel a bit of a muppet for asking this, but I'm creating a drawing which has a tapped hole all the way through, and I can't find any information on how to actually indicate within the ISO guidelines on which side to tap the hole from.

    Any ideas, or resources that you could point me to would be gratefully accepted.

    Thanks.

  2. #2
    Administrator Kelly Bramble's Avatar
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    Doesn't matter where they tap from as your asking for threads "all the way through".

    Don't forget that there should be thread relief on both sides of the threaded hole feature. If you have specific requirements as such - state it...

    BTW, welcome to EE!

  3. #3
    Associate Engineer
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    This explains why I felt like a muppet ;]

    I'm not a machinist, but I have tapped my share of holes but for some reason I'd never thought about the thread being operable from either side

    Thankyou for the knock on the head and the welcome :]

  4. #4
    Technical Fellow
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    Quote Originally Posted by logos View Post
    I'd never thought about the thread being operable from either side
    Welcome, and the unofficial rule-of-thumb is to drill and tap from the side that the Leader points to on the drawing.

    I was a Toolmaker in a muuuuuuch earlier time-frame.

  5. #5
    Administrator Kelly Bramble's Avatar
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    Bet ya I can produce a drawing where you can't drill and tap from from the leader side.

    Nyuk, Nyuk, Nyuk Wowowowow ..

    Quote Originally Posted by PinkertonD View Post
    Welcome, and the unofficial rule-of-thumb is to drill and tap from the side that the Leader points to on the drawing.

    I was a Toolmaker in a muuuuuuch earlier time-frame.

  6. #6
    Technical Fellow
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    Quote Originally Posted by Kelly Bramble View Post
    Bet ya I can produce a drawing where you can't drill and tap from from the leader side.
    I bet you can Kelly, what's worse I bet you would! LOL

    I was a Draftsman in a not quite so muuuuuuch earlier time-frame.

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