View Full Version : stud length rule check


Ruckus46Gt
10-16-2008, 05:15 PM
Ok just swapped out my stock 1.5" studs for apr 2.5" studs and well they dont go as far as i wanted but also dont look retarted with my stock rims on like the 3.5s would have. Anyway just wanted to make sure I am reading the rule correctly

Nhra states

Wheel studs must be threaded into hex portion of lug nut a distance at least equal to the diameter of the stud



So that means it would have to go halfway in to the head section of the shank lug or go past the red line (lets say that is the halfway mark of the head section cause tech itwould be open end not closed like the pic)
http://img380.imageshack.us/img380/2591/magshankverificationzf2.jpg

daniel6718
10-16-2008, 06:35 PM
i believe the rule is the diameter of the stud is how far it must go into the lugnut

tim99ws6
10-16-2008, 06:45 PM
i believe the rule is the diameter of the stud is how far it must go into the lugnut

According to tech at the NMCA event, that is not correct. I was almost DQ'd for the LSx shootout based on my studs. My ARP studs pass into the hex head section, but are NOT into the hex head portion equal to or greater than the diamater of my studs. They were very strong on this point, and went so far as to say i should pull my studs and buy new ones that are longer and change them at the track. To say the least, I was pissed, but can understand the need for safety.



I will be putting the 3.5" ones in the axles over the winter.

Villain281H
10-16-2008, 08:41 PM
NMCA/NMRA is usually strict on rules and go by the NHRA rulebook (IHRA if track racing at applies) to the letter. If you are the least bit fuzzy on clearance, call you local tech director and ask them for clarification. Check out www.nhra.com (http://www.nhra.com) for a list in your area.

Derek

jmill96Z
10-16-2008, 09:04 PM
I have had to take a lug nut off before to let the inspector measure it. The stud must penetratethe hex portion of the lug nut, at least the diameter of the stud. It's pretty simple. If you have a 1/2 in stud, take the lug nut off, turn it around and measure how deep it goes into the hex.

Ruckus46Gt
10-16-2008, 10:22 PM
yea mine are 2 full turns from def passing. measured a bunch of shit checked etc. I'm going to order longer studs and the puller tool and do them after this weekend for but this weekends race looks like i'm cutting my other set of arp's up and making some false fronts

jmill96Z
10-16-2008, 11:57 PM
I'm not advocating false fronts, but don't cut up those nice arp's. Cut up some bolts.

Ruckus46Gt
10-17-2008, 01:22 AM
I'm not advocating false fronts, but don't cut up those nice arp's. Cut up some bolts.

To late, I'm not a fan of false fronts and normally wouldnt do it but these are so close to passing its not even funny. I know I will be good at the one track , but the other the guys are dicks. I litterally am 1mm away from being fully legal. If I had stock studs yea I wouldnt be doing false fronts I'd be running my stock rims

JL ws-6
10-17-2008, 04:44 AM
One thing I can promise you, is that if the stud is sticking out the end of the lugnut, they are NOT going to give you any crap about it.

I'm on a 5.8 rear stud now so I run the big alum washer and the nut and the stud still sticks out a bunch there, and the fronts are a 1/2 inch stud that also sticks out of the lugnuts on the front.

If they're out the end of the lugnuts, you will never have a problem. Looks goofy with stock wheels, but the only people that would ever say anything are the ones that have no clue.

Villain281H
10-17-2008, 07:57 AM
If they're out the end of the lugnuts, you will never have a problem. Looks goofy with stock wheels, but the only people that would ever say anything are the ones that have no clue.
But I want to use my stock caps :lol:

JL ws-6
10-17-2008, 08:08 AM
Villian I somehow knew someone would say that LOL.... wasn't expecting it from you :jest: