This procurement specification covers bolts and screws made from a corrosion and heat resistant, age hardenable iron base alloy of the type identified under the Unified Numbering Systems as UNS S66286. The following specification designations and their properties are covered: AS4959 140 ksi minimum ultimate tensile strength at room temperature 70 ksi stress-rupture strength at 1200 degrees F; AS4959-1 140 ksi minimum ultimate tensile strength at room temperature 84 ksi minimum ultimate shear strength at room temperature.