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SAE AMS 6346D-2023
Steel Bars 0.95Cr - 0.20Mo (0.28 to 0.33C) (SAE 4130) Aircraft Quality Hardened and Tempered, 125 ksi (862 MPa) Tensile Strength
This specification covers an aircraft-quality, low-alloy steel in the form of heat-treated bars 1.50 inches (38.1 mm) and less in diameter or least distance between parallel sides.
Society of Automotive Engineers [sae]