Grand Prix V6-191 3.1L VIN M SFI (1998)
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)
