Thread: Helicoil
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Old 05-30-2016, 10:25 AM   #7
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Join Date: May 2010
Location: Long Island, NY
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Default Re: Helicoil

The recommended drill size included in the 1/4-20 set is 17/64".

This drill measures .2656", the letter "H" mentioned above measures .266" and will work fine in this application also. Most general shops will have the 17/64" available, maybe not the letter series however??

Thanks, Gary in N.Y.

P.S. Hi Paul, the "#7" mentioned above is .201" and is much too small! It is correct for a "new" 1/4-20 hole size.
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