Was looking for the lug nut torque on my old '66 C60 today...found it in the owners manual. Spec for flanged one-piece nuts is 3-400 ft/lb.

The strange thing is I measured the wheel stud thinking they would be either 5/8 or 3/4" but no....they're 11/16 dia.
Never heard of studs that size and Mr. Google doesn't seem to have heard of them either.