Lug nut torque question?

[sandy43]

Been reading about Cambridge 9/16 lug nuts vrs standard 1/2 nuts. I believe my Alpine (16" wheels, 8 lugs, 2 - 7K axles) has 1/2" studs, am I right??? What RV uses 9/16 studs? According to the book, 1/2" should be torqued at 110-120 flbs. I do mine at 115 flbs. Should I go to 120 flbs? Wheels and tires have become a big priority in RVing for me, because of an incident involving a broken aluminum wheel distributed by Tredit to Keystone RV's. Thanks

[chuckster57]

If the spec is 110-120 and your torquing to 115, I would say your good. Your torque wrench is probably not exact, so being in the middle of the spec is a good place to be.

[gearhead]

If you want to be sure what size they are, take one off and go to an auto parts store and get them to match it to either a 1/2" or 9/16" stud.
Torque to that spec....dry threads.

[jsmith948]

Use a tape measure, or a bolt sizing card (available at most auto parts stores) and measure the studs. I torque the lug bolts on our Cougar to 120 lb/ft in 3 increments - 40#,80#,120# - re-torque after about 50mi and then check the torque every time we hit the road - every time:)