Size Specification ASTM SA307 Grade A:ASME B18.2.1 hex bolts ASTM SA307 Grade B:ASME B18.2.1 heavy hex bolts Material Spec & Grade ASTM SA307 Grade A: minimum tensile strength of 60 ksi and intended for ASTM SA307 Grade B: Applied to flange piping sy...

Size Specification ASTM SA325 Type 1: ASME B18.2.6. heavy hex structural bolts ASTM SA325 Type 3: ASME B18.2.6. heavy hex structural bolts Material Spec & Grade ASTM SA325 Type 1: Medium carbon, carbon boron, or medium carbon alloy steel. ASTM SA325 ...