Since the axles nuts will be torqued and "staked", does that eliminate the need for Loc-Tite?

 

Loc-Tite is most definitely NOT needed. Don't even think about putting that on the threads.

 

At nearly 250 lb/ft, no Loctite in the world is going to do anything anyway.

 

Find the post made by "dwight" that says Billman endorsed. There is new info in there that is very important when working with the axle nut.

 

I wouldn't be so quick to judge. There's a lot of surface area on a fastener that size. In addition it will be acting on a larger radius.

Compare the 24mm axle nut to 90 ft-lbs for a 12mm lug nut. (Not an application that uses thread locking adhesive, but something off the top of my head and an easy 2:1 ratio.)
Bonding Strength = Material Property of Adhesive * Surface Area * Moment Arm
Surface Area: (assuming the same relative width, in this case 1 thread width, e.g 12mm engagement for the lug, 24mm for the axle): pi*dia*dia
Moment Arm: dia/2
---> Bonding Strength = (Mat Prop * pi / 2) * dia[sup]3[/sup]
From this we see that bonding strength is expected to be proportional to diameter cubed.

So, comparing the lug to axle nut, that's a factor of 8. If the lugs get 90 ft-lbs, then that suggests 720 ft-lbs for the axle nut. Even if the axle nut is getting torqued to 400 ft-lbs, that isn't that much. If we look the other way at those common M6 bolts (10mm heads), they'd be looking at about 11 ft-lbs, which again is pretty much expected. So at a glance, I think it might be fair to say size might not matter too much.

I think the biggest issue larger sized fasteners might not be their size, but their tolerances. With larger sized fasteners the threadlocking adhesive might have a greater thickness which may reduce strength. I'm not sure because the thread will deform as it makes contact so it might be a small effect. I guess the point is, I wouldn't be too quick to dismiss its effectiveness on large fasteners.

On a more practical note, the application guide(pdf) says that regular blue Loctite 243 Threadlocker is good for 1/4" to 3/4" (19mm) fasteners. The 24mm nut isn't that much larger, but they also have plenty of products which are designed for larger fasteners (e.g. 2047, 249, 263, 268).

Nonetheless, using thread locking adhesive is neither warranted nor advised.

 

I'm happy to see that you expended that amount of math and physics to contradict one tiny little trite statement I made. As it is not my area of expertise, I can neither confirm nor refute your equations.
You are most welcome to not stake your axle nut and just go with Loctite.

 

Good one! LOL

 

Axle nut was torqued, staked and no Loctite was used. Rear end vibration is gone.