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Thread: Drill bit size/ NPT question
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07-17-2008, 10:10 PM   #3 (permalink)
BrianS
 
Join Date: Jul 2006
Posts: 399
Re: Drill bit size/ NPT question
The Machinery Handbook says 9/16-19/32 depending on what brand tap.

Ideally the hole should be reamed before tapping with a reamer having a taper of 3/4" per foot.
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