i'm not 100% sure, but i believe the circle track nuts are a 45* taper, while the factory nuts are 60*. with that being said, i have, on numerous occasions, used the circle track nuts without any problems what so ever on factory steel wheels. no nut or seat damage, and no loosening occurring over several thousands of miles. i always use just a tic of anti-seize on the stud threads. many do not like this practice, but i have never had galled stud threads or loosening of nuts in years and years of doing this.