Need Help! tap size - CNCzone.com-The Largest Machinist Community on the net!

laamar · #1 11-26-2009, 12:11 PM

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.

laka · #2 11-26-2009, 11:01 PM

Standard formula is thread diameter (0.875") - Pitch (0.050").

I think this is good for 70% thread

beege · #3 11-27-2009, 07:25 AM

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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