AISI 5160 is a medium-carbon through-hardening alloy steel recommended for heavy duty service in gearing, shafting, tools, hot work dies and springs. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: SA-207. Producer or source: Alloy steel mills and foundries.