Would anyone happen to know the lug nut size for the s197?

Metric would be better

thanks

 

Thread is 1/2 20TPI.

It's not metric.

 

4.5 bolt circle
1/2-20 NFT

 

I just replaced my OEM ones with the black ones from American Muscle.
I noticed that before removing a few of the stock ones that they could be turned slightly, maybe 2 mm each way, even though they were fully on and hard to get off.

 

thats the problem... they are all on tight, but a couple are spinning...who came up with 2 piece lugnuts anyway?