1.1 This specification covers aluminum structural bolts and nuts for use in the construction of aluminum transmission towers, substations, and similar aluminum structures. 1.2 Diameters of bolts and nuts furnished to t This specification covers aluminum transmission tower bolts and nuts. Bolts shall be manufactured from alloy 2024 and nuts from alloy 6061 or 6262, and shall be cold formed, hot formed, or machined formed. Alloy materials for bolts and nuts shall confo