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Thread: Looking for articles discussing angle axis differences between holes and screws

  1. #1
    Associate Engineer
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    Looking for articles discussing angle axis differences between holes and screws

    Looking for articles discussing angle axis differences between threaded holes and screws.
    Are there errors between the screw axis and axis of the threaded hole that the screw goes into?

  2. #2
    Technical Fellow jboggs's Avatar
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    In a perfect world, no. A perfect screw will be perfectly positioned by a perfect thread. So, its simple - make them both perfect!
    Seriously, in the real world there are manufacturing imperfections and clearances involved. The final position of a screw in a threaded hole is affected by many factors so the best you can say is that it is "close". That's why it is NEVER a good idea to try to use screw threads for any kind of precise positioning or alignment.

  3. #3
    Administrator Kelly Bramble's Avatar
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    Quote Originally Posted by jboggs View Post
    In a perfect world, no. A perfect screw will be perfectly positioned by a perfect thread. So, its simple - make them both perfect!
    Seriously, in the real world there are manufacturing imperfections and clearances involved. The final position of a screw in a threaded hole is affected by many factors so the best you can say is that it is "close". That's why it is NEVER a good idea to try to use screw threads for any kind of precise positioning or alignment.

    Good post...

    Also, to compare thread features, see:

    External Thread Size, tolerances and Geometry

    Internal Thread Size, tolerances and Geometry
    Last edited by Kelly Bramble; 11-27-2013 at 10:56 AM.

  4. #4
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    Thank you,

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