Historical
SAE AMS 5624E-1989 (SAE AMS5624E-1989)
Steel Bars High Expansion, 4.5Mn 4.0Cr 12.5Ni(0.50-0.60C), Cold Finished ( Reaffirmed: Oct 1993 Apr 2006 )
This specification covers an alloy steel in the form of bars 1 inch (25.4 mm) and under in nominal diameter or distance between parallel sides. Primarily for bolts and screws requiring a coefficient of thermal expansion approaching that of aluminum alloys. This steel is hardenable only by cold working.
Society of Automotive Engineers [sae]