1920 disc wheel bolt

[RKS]

Have a set of disc wheels and hubs. 
I do not have the original bolts but appear to be 9/16 with a 20 thread per inch pattern. I have the 18 per inch and these not work. Does anyone know of a source for the 9/16 20s 

Amazon has a tap this size but not the bolts. 
thanks in advance 

Ron
 

[wayne sheldon]

Check direction of thread as well! Some disc wheel cars in those days used right-hand threads on one side of the car, and left-hand thread on the other side of the car.

What make of car are these wheels for?

[34LaSalleClubSedan]

Looks like Packard

[ryan95]

Moon was an assembled car and used Disteel brand wheels. The Moon wheels are very similar and have similar rings, but as far as I know, Moon never used a 6 lug hub. Maybe search for what other cars used Disteel wheels and you will find your answer. The Moon lug bolts on the car I am restoring used a 9/16-18 thread. Here are the reproduction bolts we just had made based on measurements from the originals. It was a costly process.

[1912Staver]

They were an O.E.M. option on quite a few cars as well as being supplied aftermarket for almost any popular car of the era. 

[RKS]

These are early Lincoln wheels. 23 inch. Could also use another (for a spare) if it were around. Thanks for the all the comments. Will keep everyone posted. Talking with someone now about possible correct bolts. 

[RKS]

[wayne sheldon]

Very rarely see disc wheels on model L Lincolns! A long-time cherished friend of mine has a 1925 close-coupled sedan with its original disc wheels. 

I am fairly sure he does not have an extra wheel. Besides, I think the 1925 wheel/tire is smaller than 23 inch.

[RKS]

These did end up being 9/16-18 size. 
Had some bad threads when initially tried. They are also all right hand treads. 
Ron

[hook]

On 5/10/2021 at 8:02 PM, RKS said:

These did end up being 9/16-18 size. 
Had some bad threads when initially tried. They are also all right hand treads. 
Ron

Another thing about 9/16-18UNF bolts. Most all the 9/16 wheel bolts of the 20's & 30's had a hex head size of 7/8". Modern 9/16-18UNF bolts have a hex head size of 13/16. It's getting hard to find the old bolts with the larger heads that can be made into lug bolts and making them from scratch gets expensive.

[ryan95]

I am not sure if the Lincoln bolts are the same, but here are some measurements of the Moon bolts. The hex in our case was 3/4 and the head was 1/2 inch tall. The wheels are hub centered, so there is no taper on the bolts, just a step so that the corners of the hex don't dig into the ring underneath. Other than looks, the most important thing would be that they do not have a tapered seat. I have looked long and hard for any other lug bolt option. All that I could find were lug bolts with tapered seats. If you can't find a close up picture of the original Lincoln ones, maybe try getting some that do have the taper and having machinist remove the taper on a lathe.

[RKS]

Thanks for everyone’s input. It all helps. 
Ron

[hook]

On 5/12/2021 at 12:11 PM, ryan95 said:

I am not sure if the Lincoln bolts are the same, but here are some measurements of the Moon bolts. The hex in our case was 3/4 and the head was 1/2 inch tall. The wheels are hub centered, so there is no taper on the bolts, just a step so that the corners of the hex don't dig into the ring underneath. Other than looks, the most important thing would be that they do not have a tapered seat. I have looked long and hard for any other lug bolt option. All that I could find were lug bolts with tapered seats. If you can't find a close up picture of the original Lincoln ones, maybe try getting some that do have the taper and having machinist remove the taper on a lathe.

Franklin wire wheels were made by The Motor Wheel Corp., as were many other cars. Here is the drawing for their wheel bolts.