Broken wheel stud and lug nut.

Originally Posted by ChrisSlicks

There are two sized holes in the wheel for each stud and the taper can touch the smaller of these holes, although with the washer style nuts it will probably never touch as the washer will make contact with the flat area first. Even with hub-centric wheels there can be a small amount of rotational play on the studs, on ours it is extremely minimal if non-existent. Hub-centric means that the wheel self centers over the hub (i.e. tight fitting hub) rather than being centered by the lugs. I wasn't suggesting that this was a lug-centered setup but rather that the taper could help to center the hole opening on the stud to stop it from crushing the threads with rotational movement. The McGards at least are the correct length and have the washer area so they are 10x better than what most of us received on our car.