1.1 This specification covers two types of quenched and tempered steel heavy hex structural bolts having a minimum tensile strength of 120 ksi for sizes 1.0 in. and less and 105 ksi for sizes over 1.0 to 1½ This specification covers the chemical, mechanical, and dimensional requirements for two types of heavy hex structural bolts made of quenched and tempered steel that are intended for use in structural connections. These bolts are designated by type, de