Lug Bolt Replacements

[jerry hartley]

I recently installed Aluminum Wheels and am concerned that the lug bolts
are not long enough. They are about 3/16" too short to reach completely
through the lug nut. A post earlier today gave the NAPA part number for
Lug Bolts (641-1359). These bolts are 2.4" long, compared to 1.95" bolts
which are now on my 76 Royale. NAPA bolts should be perfect for the
Aluminum wheels. Did anyone else have this problem? My lug bolts may not
be stock - wheels were chromed - lug nuts were not stock. Jerry

 

[wayne newland]

Jerry

about a year and a half ago, there was a lot of debate about whether or not
the stud had to come thru the nut, and it was decided that it wasn't
necessary. What was important - that the proper lug nut be used, especially
with the Alcoas. My lug nuts on my Alcoas do not come all of the way thru.
Proper torque is vital.

Wayne Newland F9300 75 Palm Beach Columbia, Md

> I recently installed Aluminum Wheels and am concerned that the lug bolts
> are not long enough. They are about 3/16" too short to reach completely
> through the lug nut. A post earlier today gave the NAPA part number for
> Lug Bolts (641-1359). These bolts are 2.4" long, compared to 1.95" bolts
> which are now on my 76 Royale. NAPA bolts should be perfect for the
> Aluminum wheels. Did anyone else have this problem? My lug bolts may not
> be stock - wheels were chromed - lug nuts were not stock. Jerry

 

[john wright]

Jerry,

It is NOT necessary to install the longer studs to use the Alcoa Wheels
on the GMC. The original lug bolt length provides sufficient threads
for 100 % strength when using Alcoa wheels. The pitch diameter for a
9/16 NF thread is 0.526". The GMC studs, Alcoa wheel and nut
combination allows for 0.532" of thread, which is more that the pitch
diameter of the stud. The longer stud does not provide more strength,
it just has more threads exposed. The only reason that I would replace
studs would be if they had been streached. You can check that by
running a lug nut the entire length of the stud and you should be able
to do it with your fingers without any resistance. Just be sure that the
threads are clean. Just wire brush and use NO oil or lube on the studs.

J.R. Wright
GMC Greatlaker
77 ELeganza II
Michigan

>
> I recently installed Aluminum Wheels and am concerned that the lug bolts
> are not long enough. They are about 3/16" too short to reach completely
> through the lug nut. A post earlier today gave the NAPA part number for
> Lug Bolts (641-1359). These bolts are 2.4" long, compared to 1.95" bolts
> which are now on my 76 Royale. NAPA bolts should be perfect for the
> Aluminum wheels. Did anyone else have this problem? My lug bolts may not
> be stock - wheels were chromed - lug nuts were not stock. Jerry