Thread size wheel stud?

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No, the 1/2 is actually closer to 13mm. Also, the thread pitch is different between metric and standard.
 
No. They are 1/2-20 UNF. Pretty common lug nut used on many makes.

A M12 if you could get is started would strip and make a mess of the stud and the lug nut.
 
Go see Duncan at south side auto he’s a mopar guy .
Met him at a car show years ago ,kept in touch with him ever since he’s a buyer and seller of parts in the place you live .
 
And just for future reference, the answer to the question "Can I use a metric nut on an SAE stud" is always "HELL, NO!"
 
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