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socket wrenches metric sizes. The tables below show the commonly-available sizes of metric socket wrenches and the fasteners they fit. A 12-pt socket fits both hexagonal, square (sort of), and 12-pt heads (the last found mainly in aerospace bolts, but also on automobile engines as, for example, head bolts).What size is a metric bolt?
The size of a metric bolt is specified using pitch, diameter, and length in millimeters. For example, in M8-1.0*20, the “M” means the Metric thread designation, the digit 8 refers to the Nominal diameter (in millimeters), 1.0 refers to the pitch, and 20 refers to the length.