Stud bolts for oil industry ASTM A193 GR B7 with hexagon nuts ASTM A194 GR 2H Each 24 STUD BOLTS W/2 HEAVY HEX NUT; ASSEMBLED; COMBINED (IMP SIZE X METRIC LG) ALLOY STL ASTM A193 GR B7/ASTM A194 GR 2H, 1"X 200MM BOLT LENGTH Each 40 STUD BOLTS W/2 HEAVY HEX NUT; ASSEMBLED; COMBINED (IMP SIZE X METRIC LG) ALLOY STL ASTM A193 GR B7/ASTM A194 GR 2H, 1 1/2"X 346MM BOLT LENGTH