Is It Possible To Put 9/16 Thread On A 5/8 Bolt?

Gubni, you mentioned earlier that you need 32 of them, which tells me that there are 8 per wheel, meaning that this is for a 3/4 or 1 ton truck. I also went back and read your introductory post where you indicated that you have a "rock bouncer" which I suspect is another name for a rock crawler. So, I am guessing that you are trying to fit steel disk wheels with oversize tires to your axles. Considering the severe duty that your wheels and lugs will endure, there is no way that I would do anything to weaken the studs in any way. I personally would not want the liability.

We have nothing against helping you out a bit, but you need to tell us a little more about what you are trying to do. There are other members here that have experience with rock crawlers and other sorts of modified vehicles, and they may be able to help you out. As the old saying goes, there is more than one way to skin a cat. In the interest of helping you out, I have a few questions for you:
  1. Have you considered modifying the holes in the wheels? It may be much easier and a stronger solution as well.
  2. Are the wheels hub piloted, or are they stud piloted?
  3. What is the Dorman part number for the stud you are trying to use?
  4. What year and make vehicle are the axles or hubs from?
I found 5/8" Dorman studs that are 2" in length with threads that go all the way up to the knurl. Take a look at this part number for starters: 610-048 It is meant to fit a 1972 Dodge 1 ton (D300) It has a knurl diameter of .660" so will not fit a Ford hub unless you ream the holes in the hub slightly, but that might be a bit tricky to get the hole diameter just right. Even so, it would be easier and safer to modify the hubs or modify the wheels than to modify the wheel studs.

Share a little more information with us, we like a good challenge!
 
Even putting a new set of holes in the hub abandoning the old ones would be a safer thing to do. Recutting those threads without a relief groove would be absolutely necessary if you choose to go ahead with that approach, but there will likely be a flaw in the new threads where the old ones stopped. This would be a highly stressed point on the stud making them weaker than designed.
 
another possibility would be to get 32 good hardened 9/16 -18 bolts with enough threads and then make some bushings to fit them tight in the hub with no slop-----as long as you have enough space behind the hub for the heads they should work fine---then just check them often---You could go to finer thread on the bolts to match regular lug nuts------Dave
 
The original thread was a rolled thread . Great for resisting fatigue.
If you turn down the bolt and cut a new thread you have stress concentrations at the root of the thread. Poor fatigue life.
And then there are issues of liability.
Safer to modify the wheels.
 
how about drilling out the rims for a bigger nut?
 
I would suggest that piloted drill bit followed by a reamer on the wheels would be the proper answer. As it would be safest option giving you full strength and would be 32 quick clean operations.

Sean
 
The solution must be independent of the wheels. I decided to sleeve it and to use the OEM studs.
 
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