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Thread: tap size

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  1. 11-26-2009, 07:11 PM #1
    laamar
    laamar is offline Registered
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    Question tap size

    I need to make a part and this has a threaded hole 7/8 unef. The customer as supplied the tap but is not sure of the drill, i have searched the net for this size and have conflicting sizes from 0.812 to 0.832 / 20.62 to 21.15. Any help would be well appreciated.
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  2. 11-27-2009, 06:01 AM #2
    laka
    laka is offline Registered
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    Standard formula is thread diameter (0.875") - Pitch (0.050").

    I think this is good for 70% thread
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  3. 11-27-2009, 02:25 PM #3
    beege
    beege is offline Registered
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    My "ThreadPal" software calls for a hole Ø.826 to Ø.830, 70-75% thread. I recommend to anyone working with threading to invest in this simple program.

    http://closetolerancesoftware.com/index.html
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