Wheel Stud And Wheel Bolt

Some cars use studs with nuts; others use bolts screwed into the hub. Lengths and seat shapes differ between steel and alloy wheels. Locking bolts prevent theft. Studs can be pressed in and out of the hub; bolts are simply replaced. Do not oil threads unless the manufacturer says so, as this changes the clamping force. Keep the locking bolt key in the car, usually with the tools.

Clamping force holds the wheel against the hub so friction carries the load.

Wrong bolts or seats can let a wheel come loose. Damaged threads must be replaced, not reused.