THE BOLT SUPPLY HOUSE LTD H5CZ516.1 BOLT HEX NC GR5 5/16 X1C/S ZINC

Grade 5 fasteners are made of medium strength carbon steel and are specified under the Society of Automotive Engineers (SAE). These bolts are heat treated in a controlled atmosphere from 1?4 in. through 1-1/2 in. with a minimum tensile strength of 120,000 psi in diameters through 1 in. and 105,000 psi for diameters over 1 in. through 1-1/2 in. Grade 5 Bolts are equivalent to , so when finding the right bolt, be sure to match the grades on the bolts being used. Grade 5 bolts can often be identified by the 3 marks on the head.