Kelsey Hayes longer wheel studs
BTW, if anyone cares, the NHRA has a rule on wheel studs. I think a lot of guys will say that you are required to run longer studs but I do not believe that's how the rule is interpreted.
..."Thread engagement on the lug must be equivalent to or greater than the diameter of the stud or bolt. Length of the stud/bolt doesn't determine permissibility (example: a 7/16 inch stud must be thoroughly engaged through the threads in the hex portion of the lug a minimum of 7/16 inch."...
So a little math - threads on the OE studs are .9xx". On the Centerline lug nuts I have, the shank is 1.3". Studs are 7/16 (Thread pitch) =.437" so using those specs, it would appear that there is more than double the thread engagement necessary as per the NHRA rule but unfortunately they specify through the
hex portion of the lug. If that's the case, it's way short, the threads don't even make it to the hex portion with these lug nuts. The wheel is indeed 1.3" thick so I need to use the 1.3" shank. There's no mention of shank style lug nuts which are threaded all the way up. It's a little unclear.
According to the P.O. of my car, it went 11.97 and it had the OE 10" drums with closed end lug nuts. Guess it must have been OK? I think if the tech guy sees you have closed lug nuts, they make you remove them to check for proper engagement. That's why people say that you
need the longer ones - there is nothing to question because the tech guy can see them clearly and they move on, no hassle.
