GM Service Manual Online
For 1990-2009 cars only

All models use metric wheel nuts and wheel studs. The nut does have the word metric stamped on the face and the stud has the letter M stamped into the threaded end. The word metric is stamped on the head.

The thread size of the metric wheel nuts and wheel studs are M 12 x 1.5. This signifies:

    • M = Metric
    • 12 = Diameter in millimeters
    • 1.5 = Millimeters per thread

If a broken stud is found, refer to Wheel Stud Replacement in Front Suspension or Wheel Stud Replacement in Rear Suspension.