12MM Wheel Studs

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triumphcorvair
Posts: 25
Joined: Mon Jul 25, 2011 2:47 pm

12MM Wheel Studs

Unread post by triumphcorvair » Fri Jan 12, 2018 1:20 pm

I just received by Scarebird disc brake brackets to begin my conversion on my 65 140 Monza. I've done the search and read everything that I could find regarding this conversion. I found a lot of good information regarding part numbers on the calipers, rotors, MC, etc. The one part I could not find a consensus on was wheel studs. Due to the thickness of the disc brake rotors, longer wheel studs will have to be installed. In my information search I have found the 12mm wheel stud is the correct diameter that will match the GM (S10 4WD) rotor stud hole diameter. I know that in addition to having the hubs turned down to fit the rotors, the stud hole diameters will have to be enlarged to accept the 12mm studs.

Since 12mm studs are used on a number of different vehicles, does anyone have a part number for a 12mm stud that they have used for this conversion?

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jetcat
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Re: 12MM Wheel Studs

Unread post by jetcat » Sun Jan 14, 2018 9:11 am

I used ARP 1007708 12mm studs. Drill holes with 19/64" drill and ream to 0.500. Cut studs length to desired length. There long..... Press in. The picture is my rear hub but it is the same for the front.Image

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jetcat
Posts: 11
Joined: Tue Mar 21, 2017 12:03 am

Re: 12MM Wheel Studs

Unread post by jetcat » Sun Jan 14, 2018 9:14 am

jetcat wrote:I used ARP 1007708 12mm studs. Drill holes with 19/64" drill and ream to 0.500. Cut studs length to desired length. There long..... Press in. The picture is my rear hub but it is the same for the front.Image

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Try pic again.Image

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Wagon Master
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Joined: Thu Jul 28, 2011 6:36 pm

Re: 12MM Wheel Studs

Unread post by Wagon Master » Mon Jan 15, 2018 2:19 pm

I used ARP 1007708 12mm studs. Drill holes with 19/64" drill and ream to 0.500.

Are you sure on that drill size?

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jetcat
Posts: 11
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Re: 12MM Wheel Studs

Unread post by jetcat » Mon Jan 15, 2018 9:51 pm

It is incorrect, I drill about 0.016" smaller than my reamer. 31/64" or maybe 15/32" will work. With a drill bit, I can never get it right on and the 1/2" dim is important for a good press fit.

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triumphcorvair
Posts: 25
Joined: Mon Jul 25, 2011 2:47 pm

Re: 12MM Wheel Studs

Unread post by triumphcorvair » Tue Jan 16, 2018 6:45 pm

Thanks for the responses and part numbers. My plan is to have the machine shop turn the hubs and install the studs. Hopefully they won't give me to much grief about it.
Not real big on having to cut the length down. I have seen a special tool that is used in a drill to "chamfer" the ends of the bolt to finish it.

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