HI-QUA-LED 43L40 is a free-machining nickel, chromium, molybdenum alloy steel having high hardenability. It is oil hardening and exhibits combination of high tensile and endurance strengths along with ductility and toughness. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on forming, heat treating, machining, and joining. Filing Code: SA-191. Producer or source: Alco Products Inc., Forge & Spring Division.