Historical
SAE AMS 6382R-2018
Steel, Bars, Forgings, and Rings 0.95Cr - 0.20Mo (0.38 - 0.43C) (SAE 4140) Annealed
This specification covers an aircraft-quality, low-alloy steel in the form of bars, forgings, flash-welded rings, and stock for forging or flash-welded rings.
Society of Automotive Engineers [sae]