Why do lug nuts not loosen threaded studs when removed if the torque on them is much higher than on the stud?


100ft/lb vs. 30ft/lb for the studs.

Threadlock is said to be optional.

Is it because the torque required to loosen the lug nut is acting upon the wheel not the stud? And the only moment applied to the stud is friction between the threads? (which is low)



In: 4

The thread area on a nut is much smaller than on the long threads of a stud. So with different torques, the looser threads can be “stronger” because they have a larger area.

I swear to god… you should send this question to Veritasium! I can’t make sense of it either.


Why would the stud unthread? It isn’t an all-thread they have stoppers and are splined at the hub not threaded.

I think the answer you’re looking for is this. [https://s7d2.scene7.com/is/image/SteinerTractor/ABC268?$lg$](https://s7d2.scene7.com/is/image/SteinerTractor/ABC268?$lg$)

The wheel stud has a spline on it’s shoulder that is pulled into the slightly under sized hole on the drum or rotor. The teeth on the spline prevent the stud from rotating.