Correct Size Metric Heli-Coils for P229 Frame? - SIG Talk
SIG Talk Gun Forum

Correct Size Metric Heli-Coils for P229 Frame?

This is a discussion on Correct Size Metric Heli-Coils for P229 Frame? within the SIG Sauer Pistols forums, part of the SIG Sauer Forum category; I am requesting information on the size of Metric Heli-Coil that allows for continued use of factory grip screws in a P229. I believe it ...


Go Back   SIG Talk > SIG Sauer Forum > SIG Sauer Pistols

SIG Sauer Pistols SIG Sauer Pistol Forum: SIG Sauer Pistols - P210, P220, P224, P225, P226, P227, P228, P229, P232, P238, P239, P245, P250, P290, P320, P365, P522, P556, PM400, SP2022, Mosquito,

Like Tree9Likes
Reply
 
LinkBack Thread Tools Display Modes
Old 05-12-2019, 10:59 AM   #1
Member
 
Join Date: Nov 2015
Location: Alabama
Posts: 76
Likes Received 29
Correct Size Metric Heli-Coils for P229 Frame?

I am requesting information on the size of Metric Heli-Coil that allows for continued use of factory grip screws in a P229. I believe it is M4 X .70 but am not certain. Any assistance is very much appreciated.
dstan9615 is offline  
Register

Welcome to the SIG Talk Forum dedicated to SIG Sauer Pistols and SIG Sauer Rifles.

We welcome everyone and the community is free to join so register today and become part of the SIG Talk Forum!

Old 05-12-2019, 11:03 AM   #2
Senior Member
 
Join Date: Dec 2013
Location: Texas
Posts: 14,320
Likes Received 6240
Have no idea what You mean?
WHY Metric in the first place?
Firearms Collector is offline  
Old 05-12-2019, 11:19 AM   #3
Senior Member
 
Join Date: Dec 2018
Location: Fbks,AK
Posts: 1,412
Likes Received 909
A Heli-Coil will NOT have enough threads/grip length to install in a SIG P series frame.

A PEM nut properly installed/staked would be your best option to fix pulled threads in your frame.

TIG welded,which I would not recommend,for even the most experienced welder.
DansSIGs is offline  
 
Old 05-12-2019, 11:32 AM   #4
Supporting Member
Supporting Member
 
Willard's Avatar
 
Join Date: Apr 2016
Location: Evansville, IN
Posts: 10,035
Likes Received 10324
Quote:
Originally Posted by dstan9615 View Post
I am requesting information on the size of Metric Heli-Coil that allows for continued use of factory grip screws in a P229. I believe it is M4 X .70 but am not certain. Any assistance is very much appreciated.
That is the thread size of the P229, along with the P226, and P239. Considering the "boss" normally around the grip screw threads, in this case the helicoil itself would become the boss, that normally locates the grip itself into position. Considering only the thickness of the frame excluding the boss, I'm not sure it would be thick enough. I guess it would depend on the outside diameter of the helicoil itself, which would need to be less than the Boss diameter, in my opinion to have a chance at working.

Boss diameter is 6.08mm
Frame thickness is 1.24mm
Frame thickness at Boss is 2.48mm

Good Luck, an alternative could be to re-tap to the P220 size of M5-.8 and use those screws as their head diameters are close to the same.
Attached Images
File Type: jpg DSCN0575.JPG (8.15 MB, 29 views)
Willard is offline  
Old 05-12-2019, 12:01 PM   #5
Senior Member
 
ThnkFrst's Avatar
 
Join Date: Mar 2012
Location: SEMI
Posts: 11,064
Likes Received 8370
Here's a pic of my P229R with helicoils installed in the frame grip screw holes. Work was done by a local gunsmith, but I don't recall or have record of what size he used.

DSCN0610.JPG
bearone2, Rock185, Willard and 1 others like this.
ThnkFrst is offline  
Old 05-12-2019, 12:31 PM   #6
Supporting Member
Supporting Member
 
Join Date: Jan 2013
Location: :
Posts: 18,374
Likes Received 12976
Quote:
Originally Posted by DansSIGs View Post
A Heli-Coil will NOT have enough threads/grip length to install in a SIG P series frame.
Hmmm . . .

I strongly disagree. Helicoils fixed up the grip screw threads on my P938, no problemo.
JGKC9AYC, PapaD and Willard like this.
Malicious Compliance is offline  
Old 05-12-2019, 12:47 PM   #7
Senior Member
 
bumper's Avatar
 
Join Date: Nov 2014
Location: Minden, NV
Posts: 8,010
Likes Received 14352
Another alternative might be to install a glue-on flange nut like link below. A slight recess could be made in grips. Bonding would best be with a product like Loctite Depend 330 - an acrylic, almost instant adhesive that has about 2000 psi shear yet, unlike most epoxies, retains enough elasticity to allow bonding of dissimilar materials with different thermal coefficients of expansion. (Good stuff, with a one year shelf life. I think it goes unusable at day 366! So don't buy the ginormous size.)

F2-RB23 - Rotaloc International, LLC
bumper is offline  
Old 05-12-2019, 02:19 PM   #8
Senior Member
 
bumper's Avatar
 
Join Date: Nov 2014
Location: Minden, NV
Posts: 8,010
Likes Received 14352
Quote:
Originally Posted by Malicious Compliance View Post
Hmmm . . .

I strongly disagree. Helicoils fixed up the grip screw threads on my P938, no problemo.
True. Well I guess i'd have to. If it worked for the original grips, then a Helicoil would be stronger as the Helicoil threads are larger in diameter so more thread surface area. Also, the Helicoil can be put in with high strength thread locker, so the threads won't "work" in the thin aluminum web that SIG was kind (and silly) enough to provide. Grips screws will henceforth be going in and out of stainless steel female threads, with the advantage of still using original grip screw size.
Willard likes this.
bumper is offline  
Old 05-12-2019, 06:04 PM   #9
Senior Member
 
Velocette's Avatar
 
Join Date: Jul 2016
Location: South Florida
Posts: 120
Likes Received 186
A possible alternative could be using the E2 grips.
Velocette is offline  
Old 05-12-2019, 10:28 PM   #10
Senior Member
 
Join Date: Dec 2018
Location: Fbks,AK
Posts: 1,412
Likes Received 909
I stand corrected.

ThnkFrst- looks professional.

Velocette-posted the simplest & least expensive option.
DansSIGs is offline  
Old 05-13-2019, 05:39 AM   #11
Senior Member
 
bumper's Avatar
 
Join Date: Nov 2014
Location: Minden, NV
Posts: 8,010
Likes Received 14352
Quote:
Originally Posted by DansSIGs View Post
I stand corrected.

ThnkFrst- looks professional.

Velocette-posted the simplest & least expensive option.
It is a good option, but only so long as you want only E2 grips. If you DIY, the Helicoil kit can be had for about the price of E2's, and the imported knock off for way less (not including price for permanent thread locker). I just ordered a M4 - 0.7 kit for the shelf, though I don't have any that are stripped.
Willard likes this.
bumper is offline  
Old 05-13-2019, 07:46 AM   #12
Senior Member
 
Join Date: Nov 2011
Location: Yonder
Posts: 2,418
Likes Received 706
Quote:
Originally Posted by ThnkFrst View Post
Here's a pic of my P229R with helicoils installed in the frame grip screw holes. Work was done by a local gunsmith, but I don't recall or have record of what size he used.

Attachment 297752
That gun smith is both good and brave. The heli must be glued into the frame, I don't think it is thick enough to hold the coil by itself. i like the extension on the outside as you can recess the panel to make room for it. You really lucked out.
Sgt Ed is offline  
Old 05-13-2019, 08:28 AM   #13
Supporting Member
Supporting Member
 
powermad's Avatar
 
Join Date: Dec 2018
Location: Oregon
Posts: 1,207
Likes Received 1005
For that application a helicoil would work but a threadsert would be better.
They are more expensive but provide more thread surface to engage.

A helicoil works best if all the threads are supported, it is basically a spring after all.
You can trim a sert to size without it coming undone also.

A 4mx.7 sert would need to be drilled and tapped for a m8x1.25 bolt.

I just got done repairing a turbo with a botched helicoil repair.
Drill and tapped hole for a 5/8 fine thread. Trimmed a bolt to size and red lockite it in.
Redrill for 10mx1.5 bolt.
Since the shop botched the job I saved us $5k for a turbo and was the hero, again....
powermad is offline  
Old 05-13-2019, 09:15 AM   #14
Supporting Member
Supporting Member
 
Join Date: Jan 2013
Location: :
Posts: 18,374
Likes Received 12976
Quote:
Originally Posted by Sgt Ed View Post
That gun smith is both good and brave. The heli must be glued into the frame, I don't think it is thick enough to hold the coil by itself. i like the extension on the outside as you can recess the panel to make room for it. You really lucked out.
I believe TF and I used the same smith. Certainly no luck involved.
Malicious Compliance is offline  
Old 05-13-2019, 07:04 PM   #15
Senior Member
 
bumper's Avatar
 
Join Date: Nov 2014
Location: Minden, NV
Posts: 8,010
Likes Received 14352
Quote:
Originally Posted by powermad View Post
For that application a helicoil would work but a threadsert would be better.
They are more expensive but provide more thread surface to engage.

A helicoil works best if all the threads are supported, it is basically a spring after all.
You can trim a sert to size without it coming undone also.

-snip-.
I've thought about this at length before this thread. Like most all machinists (hobby machinist in my case) I have a rivnut (nut or thread sert) kit. Problem is, one cannot insert and draw up the nutsert (or thread sert) from the inside of the grip. Obviously installing from the outside, at least with the blind threaded rivets I'm familiar with, won't work as the body, threaded part, intrudes into the magazine well.

The part of the Helicoil that is threaded into the parent metal is no longer a "spring". True, it won't be as strong as if the length of the Helicoil were screwed in, but in this case the installed threads will be stronger than the original - assuming it is installed properly.

Is there a expanding rivet type thread-sert type that inserts from the outside, yet does not intrude on the inside?

Last edited by bumper; 05-13-2019 at 07:08 PM.
bumper is offline  
Reply

  SIG Talk > SIG Sauer Forum > SIG Sauer Pistols


Search tags for this page
heli-coil thread repair sig sauer pistols
,

helicoil for p229 frame

,
what size tap for p229 grip screw hole
Click on a term to search for related topics.

Thread Tools
Display Modes


Similar SIG Talk Discussions
Thread Thread Starter Forum Replies Last Post
9mm vs 45 frame size mortre P250, P320, & P320 X-5 Pistols 4 06-28-2017 09:45 PM
P250 subcompact slide on full size frame? Mc928pcar P250, P320, & P320 X-5 Pistols 6 05-07-2017 06:59 PM
SOLD! P320 Full Size, Large grip frame. agumon12 Classifieds 0 03-05-2017 12:46 PM
Which size mag for frame swap? jackskellington P250, P320, & P320 X-5 Pistols 2 10-27-2016 05:16 AM
Sig P320 Full Size Tacops Sigdoood12 P250, P320, & P320 X-5 Pistols 9 08-31-2016 01:31 PM


Top Gun Sites Top Sites List

Powered by vBulletin 3.8.8
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.6.1
Copyright © 2010 - 2020 SIG Talk. All rights reserved.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.SIG Talk is a SIG Sauer Firearms enthusiast's forum, but it is in no way affiliated with, nor does it represent SIG Sauer, Inc. of Exeter, NH.