Bethlehem O-6 is a graphitic, oil-hardening tool steel recommended where optimum machinability is desired for forming, shaping and drawing tools and dies, and where its inherent self-lubricating effect is advantageous. This datasheet provides information on composition and hardness as well as fracture toughness. It also includes information on forming, heat treating, and machining. Filing Code: TS-161. Producer or source: Bethlehem Steel Corporation.