Bolts and Screws, Steel, Corrosion Resistant, UNS S17400 Tensile Strength 140 Ksi Procurement Specification

Scope:

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.<p>Primarily for aerospace propulsion system applications where corrosion resistance and high strength in tension is required in temperatures not to exceed 600 °F.

Rationale:

General update including addition of definition spec, updating of spec callouts, addition of micro examination at X200, deletion of figures 2 and and rewording of paragraphs, adding redrawn figures for fig 3 to 8 and rounding up of figures in table 1.

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