This specification covers bolts and screws made from a corrosion and heat resistant, martensitic iron base alloy of the type identified under the Unified Numbering System as UNS S17400. The following specification designations and their properties are covered: AS7474 140 ksi minimum ultimate tensile strength at room temperature 100 ksi stress corrosion test 72 ksi to 7.2 ksi tension-tension fatigue; AS7474-1 140 ksi minimum ultimate tensile strength at room temperature 100 ksi stress corrosion test 88 ksi minimum ultimate shear strength at room temperature. Primarily for aerospace propulsion system applications where corrosion resistance and high strength in tension is required in temperatures not to exceed 600° F.
This SAE Recommended Practice applies to all combinations of pneumatic tires for military tactical wheeled vehicles only as defined in SAE J2013. This applies to original equipment and new replacement tires and the retread of these tires. This document describes tests, test methodology, and certain minimum requirements to evaluate and measure tire and tire-vehicle related performance. The mission profile of the vehicle determines which of these tests are required and should be selected. Therefore, all of the tests included in this document are not required for each tire. The tire technical activity for the vehicle system has the responsibility for the selection of a specific test(s) to be used. The selected test(s) should be limited to that required to evaluate the tire or tire-vehicle characteristic which is related to the desired vehicle performance. Selected requirements of this specification shall be used as the basis for procurement of tires for military tactical wheeled vehicles.