Size wheel studs??

[Project69]

Looking for ARP wheel studs for my 69. its stock axle in the rear soon to be 4th gen rear disc. and MPB discs front. Anyone have part numbers? Thanks

[Apogee]

What studs are you currently running? The current hole size may limit what your stud options are...it's pretty easy to make a hole larger, but not so easy to make one smaller.



ARP #100-7708 M12x1.5 x 63.3mm [2.49"] w/ .508" knurl
ARP #100-7704 1/2-20 x 3.47" screw-in stud (cut them if they're too long)

As far as direct replacements go, ARP offers some extra-long 7/16-20 wheel studs (ARP #100-7701), but they're just as much work to install as the larger ones which will provide more strength for virtually the same amount of money and effort. Summit has pretty good pricing on ARP studs and typically has most of their part numbers in stock.

Tobin
KORE3

[derekf]

Tobin, surely one of those 7708 part numbers are wrong -- they can't be both 1/2 and M12, can they?

[Apogee]

Tobin, surely one of those 7708 part numbers are wrong -- they can't be both 1/2 and M12, can they?

Oops, thanks Derek..I edited the 1/2-20 to reflect the proper part number of ARP #100-7704.

Also worth mentioning is that the pilot drill size for a 7/16-20 tap is .453" for 75% thread engagement. The OE shafts on my '73 Nova were really close already and only required a quick skim pass with a drill to clean things up and then run a tap through.

Tobin
KORE3

[Project69]

Im running stock studs front and rear. What would be the best size for me to run? Is press fit better then screw in?

[Apogee]

Stock studs would be the equivalent to Dorman 610-259 and 610-186 front and rear respectively. These are 7/16-20 RH studs with ~.472" knurl diameters with the fronts being 1.75" long and the rears being 1.5" long.

The harder you drive your car the more you can benefit from larger wheel studs, but most can get away with 7/16-20 for street use and either M12x1.5 or 1/2-20 for more aggressive applications. Due to the consequences associated with losing a wheel, I tend to be conservative and upsize whenever possible, but for reference, the C5/C6 Corvettes come with M12x1.5 wheel studs. As for press-in versus screw-in, there are pros and cons to each. I personally like them both, but prefer screw-in for aluminum hub applications.

ARP has several options with .485/.486 knurl diameters that would probably press into your existing, wallowed-out holes without modification. Typical desired interference fit is .005"-.009" for a steel or cast iron hub.

#100-7701 7/16-20 x 3.165 w/ bulleted nose
#100-7710 M12x1.5 x 1.85 w/ bulleted nose (Honda)
#100-7712 M12x1.5 x 2.85 w/bulleted nose (Honda)

Hope that helps,
Tobin