All bolts must be ASTM-A193-B7 8 3/4" x 2 1/2" Bolts 500 5/8" x 3" Bolts 56 3/4" x 3 1/2" Bolts 84 3/4" x 4 1/2" Bolts 72 7/8" x 4 1/2" Bolts All Nuts must be ASTM-A194-2H 500 5/8" Heavy Hex Nuts 148 3/4" Heavy Hex Nuts 72 7/8" Heavy Hex Nuts