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 1-1/2 in., inclusive.
1.2 The bolts are intended for use in structural connections. These connections are covered under the requirements of the Specification for Structural Joints Using ASTM A325 or A490 Bolts, approved by the Research Council on Structural Connections; endorsed by the American Institute of Steel Construction and by the Industrial Fasteners Institute.
1.3 The bolts are furnished in sizes 1/2 to 1-1/2 in., inclusive. They are designated by type, denoting chemical composition as follows:
Type 1 Medium carbon, carbon boron, or medium carbon alloy steel.
Type 2 Withdrawn in November 1991.
Type 3 Weathering steel.
1.4 This specification is applicable to heavy hex structural bolts only. For bolts of other configurations and thread lengths with similar mechanical properties, see Specification ASTM A449, page B-97.