ST Wheel Accessories

ST’s wheel hardware is chosen by four details, all of them in the title: thread, length, seat and head size. Threads cover M12 × 1.25, M12 × 1.5, M14 × 1.25 and M14 × 1.5, with a few 1/2-inch UNF parts. The seat must match the wheel: 60-degree conical, a ball seat given by its radius (R12, R13 or R14), flat, or a loose seat that turns on the bolt.

Most heads are SW17, with SW19 and a few SW21, which decides the socket you need. Plain wheel bolts sit alongside locking bolts and locking nuts, and the nuts come open or closed. A handful of adapter parts and a depth gauge for measuring wheel spacer fitment complete the section.

A spacer moves the wheel outwards, so the bolt must be longer by the same amount to keep its thread engagement. Measure the bolt you have and the spacer you are adding before choosing. Tighten wheel bolts in a cross pattern to the car maker’s torque figure and re-torque them after a short drive.

The listings are not tied to vehicles; use the thread and seat from your car’s handbook or from the bolt you are replacing.