This document provides a summary of metric grade equivalents to ASTM grades for bolts of varying diameters: - Bolts 4.6 through M24 are equivalent to ASTM grade A307A or ASTM grade 5.8, depending on whether they are cold worked. - Bolts 8.8 through M24 are equivalent to ASTM grade A325, A193B7/A354BC, or F1554G105, depending on size, with minimum tensile strengths of 830 MPa. - Bolts 8.8.3 are equivalent to ASTM grade A325 Type 3 or A449 Type 3, with minimum tensile strengths of 830 MPa, for