Aftermarket aluminum wheels - lug nut torque

[aquifer]

These aftermarket aluminum rims came on my 67. There are studs that thread into the drums, and lug nuts that thread on the studs. The nuts have washers and press flat against the wheels - not beveled. The stud size is 12x1.5mm pitch.

I have no idea what brand they are. No markings anyplace.

I broke a stud while torquing to 85#. Apparently 85 is too tight. Fortunately it was only the second one I’d done, so I tightened them all to 65# which doesn’t seem tight enough.

I know it’s only a guess, but what torque do you think would be appropriate for these lug nuts?

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Parts needed:
Front & rear NOS or used OEM door panels for a '67 in the original Gazelle color (dark tan/light brown).
Also looking for used white headliner pieces, both perforated and non-perforated.

[Glenn]

80ft-lbs.
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"

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עַם יִשְׂרָאֵל חַי

[daveblank]

I have the same wheels with the mag shank lug nuts on mine. I torque them to 80ftlb. My center caps say Empi.

[mukluk]

Book spec is 72ftlb with clean dry threads. If you use the normal recommended torque and apply any sort of lube on the threads, you can easily exceed the intended tension and damage or break them.
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1960 Ragtop w/Semaphores "Inga"

[aquifer]

Thanks for the advice. So 85 was likely a little too tight, but the fact that it snapped the stud bothers me. I wouldn't think the line between the recommended torque and snapping the stud would be that narrow (80 vs 85).

I suppose it's possible that the PO or a tire shop at some point just hammered on it with an impact and stressed the stud(s) too much, which eventually led to it snapping on me. Is that a logical conclusion? Or is the stud-snapping window really that narrow? Hopefully none of the other ones snap, but I did find a source so at least I can replace them if needed.

Thanks again.
_________________
Parts needed:
Front & rear NOS or used OEM door panels for a '67 in the original Gazelle color (dark tan/light brown).
Also looking for used white headliner pieces, both perforated and non-perforated.

[74 Thing]

Some of the studs sold are crappy material and can stretch or break.

I torque mine to 90 ft lbs then recheck after a few miles.

[viiking]