The Ford Barn

kurtis v-8-60 · 05-29-2016, 11:34 PM

need to install helicoil for 1/4x20 screw cant find chart for what size drill to use for insert. Help
Harold

1952henry · 05-29-2016, 11:42 PM

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

This work? Looks like an H.

Paul/Woodinville · 05-30-2016, 12:18 AM

According to my chart it is a #7 drill.

Ronnie · 05-30-2016, 08:15 AM

Page 16 tells all.

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

R

1952henry · 05-30-2016, 09:05 AM

Sure does. Looks to be the exact chart I posted. Size H drill

Kurt in NJ · 05-30-2016, 09:08 AM

Sponsored Links (Register now to hide all advertisements)

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

GOSFAST · 05-30-2016, 10:25 AM

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.

kurtis v-8-60 · 05-30-2016, 03:07 PM

Thanks for your help The H drill is the one

05-29-2016, 11:34 PM	#1
kurtis v-8-60 Junior Member Join Date: Feb 2011 Location: Santa Rosa Ca. Posts: 18	Helicoil need to install helicoil for 1/4x20 screw cant find chart for what size drill to use for insert. Help Harold

05-29-2016, 11:42 PM	#2
1952henry Senior Member Join Date: May 2010 Location: North Dakota Posts: 1,614	Re: Helicoil http://www.noblefix.com/helicoil/hel...ill-chart.html This work? Looks like an H. __________________ I dig coal, which provides motivation for EVs.

05-30-2016, 12:18 AM	#3
Paul/Woodinville Member Join Date: Jul 2011 Location: Woodinville, WA Posts: 60	Re: Helicoil According to my chart it is a #7 drill.

05-30-2016, 08:15 AM	#4
Ronnie Senior Member Join Date: May 2010 Location: Canada Where it snows Posts: 2,058	Re: Helicoil Page 16 tells all. http://www.helicoil.in/pdf/helicoil%20catalogue.pdf R

05-30-2016, 09:05 AM	#5
1952henry Senior Member Join Date: May 2010 Location: North Dakota Posts: 1,614	Re: Helicoil Sure does. Looks to be the exact chart I posted. Size H drill __________________ I dig coal, which provides motivation for EVs.

05-30-2016, 09:08 AM	#6
Kurt in NJ Senior Member Join Date: May 2010 Location: on the Littlefield Posts: 6,155	Re: Helicoil Sponsored Links (Register now to hide all advertisements) 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

05-30-2016, 10:25 AM	#7
GOSFAST Senior Member Join Date: May 2010 Location: Long Island, NY Posts: 1,052	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. __________________ http://www.stromberg-bulletin.com/me...berg-equipped/

05-30-2016, 03:07 PM	#8
kurtis v-8-60 Junior Member Join Date: Feb 2011 Location: Santa Rosa Ca. Posts: 18	Re: Helicoil Thanks for your help The H drill is the one

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