Posted by Owen Aaland on April 04, 2010 at 19:59:29 from (65.161.86.78):
In Reply to: Anti-Seize on Lug Nuts posted by Gary from Muleshoe on April 04, 2010 at 06:26:08:
Manufacturers and OSHA want lug nuts applied to CLEAN dry threads because that is the only way they can be sure that the proper torque is applied. The studs themselves are not strong enough to transmit the power from the axle to the wheel. If it were not for the friction between the hub and the wheel there would be a lot of wheels falling off. The amount of friction is controlled by how much force is applied by stretching of the stud. The torque specification is given to try to get close to this dimension. Any lubrication will affect how much stretching is achieved at the given torque specification. I have seen some charts where moly greases will achieve the proper stretch at just over half of the specified torque.
I have seen truck lug nuts that were installed to the point where the nut was deformed but yet did not have the proper stretch so that ended up coming loose and breaking. A stud that has been run too loose is more likely to break that one that is too tight. The reason for that is a loose stud can allow movement which continually changes the length of the stud. This movement work hardens the stud until it becomes brittle and finally fails. (This as also a major reason why head bolts/studs fail.)
With all that being said, I don't follow that advice. I always put lube on the threads and back the torque down 10 to 15 percent. I serviced the same fleet of trucks for 35 years and never had a wheel come loose so my method works for me.
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