What is the right lug nut size for GMC Sierra 2500HD ? - The thread size or thread diameter is the measurement is taken across the outside diameter of your wheel stud threads measured in either standard (7/16", 1/2", etc.) or metric (12mm, 14mm, etc.) dimensions. The most common thread sizes are 10mm, 12mm, 14mm, 7/16", 1/2", 9/16", 5/8".
