Axle ubolts

[Bsracing]

Any idea what size the axle u bolt but size is? 13/16 I gotta rap on it. I’m thinkin metric?

[Jeep Driver]

9/16

[Eagle]

14 mm, actually. They are metric.

 

9/16" is the nearest equivalent in imperial units.

[HOrnbrod]

From the parts manual:

 

U-Bolts

86-89 MJ, 52000232, 12mm Metric
90-92 MJ, 52006440, 5/8" SAE

[Eagle]

Okay, but I currently own two '88 MJs and one '87 MJ. The u-bolts in all are 14mm, and I'm about 98% certain that the '87 and at least one of the '88s is all original.

 

XJs were 12mm, MJs were 14mm.

[HOrnbrod]

Okay, the manuals are all lying. 

[Knucklehead97]

I believe he needs to know the size of the nut for the U-bolts. Mine are 13/16", and I believe my factory ones that I took off were the same. Not sure on the thread pitch or anything.

[DirtyComanche]

Is "Cut them off and buy new ones" not an acceptable answer?  Assuming he actually wants to know the socket size...

[Dzimm]

3 hours ago, DirtyComanche said:

Is "Cut them off and buy new ones" not an acceptable answer?  Assuming he actually wants to know the socket size...

This is the absolute correct answer.  They are torque to yield so do not reuse them after they have been installed. 

 

OP if you are looking to replace them, cut them off and order ubolts made for your axle, they should come with new nuts.  The nuts you need won't be at a hardware store.  You should have the correct size wrench in your toolbox for the new nuts.  If not, use calipers or tape measure to find the size you need as replacement nuts may not be the same size as factory. 

[Eagle]

When I need axle U-bolts I get them made up on the spot at a local spring shop. They come with double-thick washers and double length nuts. I can get 9/16" from them, but I've settled on doing 1/2" for both XJs and MJs. A 1/2" U-bolt is slightly larger than the stock 12mm for an XJ, and IMHO a 1/2" that's brand new is probably better than a rusty 14mm that's been torqued and possibly retorqued.