John - Here a way back in 2007 reply from Jerry (HRL) to a similar question that is still applicable today.

Originally Posted by Hotrod Lincoln
If a spec. isn't available, some rules of thumb should apply:
7/16" lug bolts- - - -65-70 ft./lb.
1/2"/12MM lug bolts- - - -85-100 ft./lb.
9/16" lug bolts- - - -110-125 ft./lb.
5/8"/16MM lug bolts- - - -125-140 ft./lb.

Going noticeably over these numbers risks bolt stretch and breakage. Much below those numbers will risk loose lug nuts after driving a while.
Jerry

~ Dan
1951 Chevy 3 window 3100
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