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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 07-11-2015, 09:51 PM   #1
joe lochner
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Join Date: Oct 2013
Location: albany ny
Posts: 8
My Ride: 2003 bmw 325xi
Exclamation Advice needed on how to drill out strut pinch bolt

Changing cv axle on my 2003 325xi and snapped off the strut pinch bolt. Been trying to extract it for 2 weeks and impossible. I've read here that it's best to drill it out with a 12mm bit (since bolt is m12x1.5x55) then replace with the e90 m12 pinch bolt that is non threaded except for nut on the end used to pinch strut.
My question is what bit to use. Since I have to drill through 2 inches of a grade 10.9 bolt while keeping it very straight (to avoid nicking shock) I would think it best to use a 12mm cobalt drill in a 1/2 inch heavy duty drill at about 600 rpm with cutting oil. Or wull a titanium bit do? Any advice will help.
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Old 07-16-2015, 06:25 PM   #2
jclip
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Join Date: Nov 2006
Location: Founder of the uber-rare body color roof club
Posts: 891
My Ride: 06 m3, 01 325
Quote:
Originally Posted by joe lochner View Post
Changing cv axle on my 2003 325xi and snapped off the strut pinch bolt. Been trying to extract it for 2 weeks and impossible. I've read here that it's best to drill it out with a 12mm bit (since bolt is m12x1.5x55) then replace with the e90 m12 pinch bolt that is non threaded except for nut on the end used to pinch strut.
My question is what bit to use. Since I have to drill through 2 inches of a grade 10.9 bolt while keeping it very straight (to avoid nicking shock) I would think it best to use a 12mm cobalt drill in a 1/2 inch heavy duty drill at about 600 rpm with cutting oil. Or wull a titanium bit do? Any advice will help.


I did this a few months back, not a fun job. From start to finish it took about an hour or so. What I did was started drilling with a 1/8" bit and stepped it up 3 times until I was able to remove the remaining material from the bolt. If you don't have a backup battery for your cordless, you'll definitely need to pick one up. Good luck.
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