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Old 05-29-2016, 11:34 PM   #1
kurtis v-8-60
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Question Helicoil

need to install helicoil for 1/4x20 screw cant find chart for what size drill to use for insert. Help
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Old 05-29-2016, 11:42 PM   #2
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Default Re: Helicoil

http://www.noblefix.com/helicoil/hel...ill-chart.html

This work? Looks like an H.
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Old 05-30-2016, 12:18 AM   #3
Paul/Woodinville
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Default Re: Helicoil

According to my chart it is a #7 drill.
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Old 05-30-2016, 08:15 AM   #4
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Default Re: Helicoil

Page 16 tells all.

http://www.helicoil.in/pdf/helicoil%20catalogue.pdf

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Old 05-30-2016, 09:05 AM   #5
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Default Re: Helicoil

Sure does. Looks to be the exact chart I posted. Size H drill
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Old 05-30-2016, 09:08 AM   #6
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Default Re: Helicoil

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usually the drill size is etched on the helicoil taps---if you have a real tap---you can also measure the diameter of the tap where the first cut of the thread shows and pick a drill that size
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Old 05-30-2016, 10:25 AM   #7
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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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Old 05-30-2016, 03:07 PM   #8
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Default Re: Helicoil

Thanks for your help The H drill is the one
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