Technical Case hardened slotted nut source

I know, a bit of an odd post but I’ve got a situation with a stripped rear axle threads on my 34 banjo rear. I know I should replace the axle and I have a spare but I just got my pickup on the road and I am not feeling it to tear it all apart just yet.

The threads on this axle were a little suspect when I put it together but had a buddy who used his thread file on it to clean it up. I thought it would be fine until Sunday when I decided to re-torque both axles nuts after clocking my first 130 miles. It won’t torque more than 50 ft lbs so I added a drum retainer for safety’s sake.

so my plan is tap the threads down one size to 9/16-18” but I cannot source online any case hardened slotted nuts this size.

Any one have an online source for such a fastener? Did Ford use this size nut? If so what’s the part number?

thanks

 

814-065

Why hardened?

 

also

 

well grade 5 nor 8 provide the torque spec required over 200 ft lb. Guess I could go with grade 8 which can be torques to 170.

 

if you make the thread on the axle smaller, you probably won't be able to tighten it to 200 ft lbs, will you?

 

get a lug nut, 611-125 or similar, and cut your own slots into the beveled side?

 

One of these might help, it restores threads from the inside out. Really, you need to replace the axle, 50 lb torque aint gonna work.

 

Case hardening steel is usually 8620 which only has 0.2% Carbon and would be around 60Rc x ~0.010" deep, so it doesn't offer any extra tensile strength over a #8 nut.
If anything, it would be very brittle.

 

used one of those thread files already to clean up the threads before I assembled the rear. Thanks

the only reason I say case hardened is I read somewhere that the original Ford 5/8” nut is.

 

It might be more important that it have a larger hex and be thicker than a normal nut.

 

Not sure if you have the room, but a coupler nut would engage a lot more of the threads. Mc Master-Carr lists grade 8 coupler nuts.

 

that's when a lathe comes in handy, to make a larger part the right size to fit what you're working on

 

The best nuts and threads around in 9/16"-18 might not be able to torque to 200 ft. lbs.

 

Clear “case” of a “hard” headed “nut” philosophy.

Just swap out the axle and be done with it. Really, it’s not a like your 100 miles away from home and a quick get me by is required.

 

Just looked up my old thread where I mentioned the spare axle is one of the “made in Argentina” ones. I discovered I mentioned in that post that it would not fit inside the diff housing.

so now, once again, the search is now on for a good used axle. Let me know if you got one..!!