STRESSPROOF is a medium carbon-manganese resulfurized free-machining steel. It is a heavy-drafted, cold drawn, straightened and stress relieved bar steel with high strength, improved fatigue resistance, and excellent machinability. It does not require heat treatment after fabrication. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and shear strength as well as fatigue. It also includes information on heat treating, machining, and joining. Filing Code: CS-2. Producer or source: LaSalle Steel Company. Originally published March 1954, revised November 1985.