Grand Prix V6-3.1L VIN J (2000)
Wheel Fastener: Description and Operation
Metric wheel nuts have the word Metric stamped on the face. The letter M is stamped at the end of the metric wheel stud.
Thread size of the metric wheel nuts and studs is indicated by the following example:
M12 x 1.5
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M = Metric
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12 = Diameter in millimeters
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1.5 = Millimeters per thread (gap between)
