AISI Type Ol is an oil-hardening, non-deforming, general-purpose tool and die steel. It has a good combination of hardness, toughness and resistance to abrasion and wear. It is recommended for cold forming and shearing applications. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on heat treating, machining, and joining. Filing Code: TS-235. Producer or source: Tool steel mills.