Changing a thread size?
Thread Starter
Racer
Joined: Apr 2001
Posts: 349
Likes: 1
From: Clayton CA
Changing a thread size?
I would like to change a M10X1.5 threaded hole in an alloy wheel to M8X1.25. This is to replace the centercap locks on 88-89 wheels. The original M10 set is no longer available and the nearest replacement is M8.
Thanks, Bill
Thanks, Bill
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
Most owners that I've seen just cut a slot in the keyed face of the bolt head and attack it with a large flat bladed screwdriver from then on instead of using a key.
No problem if your going to go with a hair larger bolt just drill/tap threads to recieve the new bolt. Use a smaller diameter bolt and you'll have to fill the hole a bit.
No problem if your going to go with a hair larger bolt just drill/tap threads to recieve the new bolt. Use a smaller diameter bolt and you'll have to fill the hole a bit.
Melting Slicks
Joined: Sep 2008
Posts: 2,376
Likes: 111
From: Cherokee National Forest TN
Check what drill size is required to tap the threads for the 8MM heli coil. If the diameter of the existing threaded bore in the wheel is smaller than the heli coil thread tap your good to go.
This information should be available on line.
I'm not at the shop today, am unable to check thread charts & give you the #'s.
Another option: get allen head bolts & paint them to match the cap.
Last edited by Churchkey; Mar 3, 2010 at 10:44 AM.
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
There is really no load on the threads it just holds the cover on...so you might just fill the hole with some JB weld drill it then tap it to what ever size/thread your after.
Thread Starter
Racer
Joined: Apr 2001
Posts: 349
Likes: 1
From: Clayton CA
Thanks for the replies.
I did a search and tried to find the info about helicoils but could not. But then I am not familiar with them so didn't really know what to look for.
The allen head is the old standby. That is what I am trying to avoid. Since it is a no load and just anti-theft. I was trying to keep close to original.
Mcgard made the OE set and discontinued them. Now the closest is the M8 size bolt. Original sets run $180. replacement type is <$20.
Thanks again for the input.
Bill
I did a search and tried to find the info about helicoils but could not. But then I am not familiar with them so didn't really know what to look for.
The allen head is the old standby. That is what I am trying to avoid. Since it is a no load and just anti-theft. I was trying to keep close to original.
Mcgard made the OE set and discontinued them. Now the closest is the M8 size bolt. Original sets run $180. replacement type is <$20.
Thanks again for the input.
Bill
