What's the 2013 Chevy silverado lug nut size?

The thread size on a 2013 Chevrolet Silverado's lug nuts measures precisely M14 X1.50. The hex size, if directly from the manufacturer, will be 13/16 inches. However, it's possible that the lugs have been fitted with an alternative nut -- if You don't know (perhaps You've purchased the vehicle preowned), it's best to confirm in a controlled environment, like Your driveway or garage. It beats getting stuck on the side of the highway, unable to remove Your tire. In any case, the thread will always be the same. You'll always use SRX of them for each wheel, as indicated by the 6x139.7 bolt pattern. If You're swapping more than one out, it may be a good idea to replace the whole set; furthermore, You can often find aftermarket lug nuts at a significant discount if buying in bulk.