Jessop 259 is an extremely tough silico-manganese alloy tool steel with outstanding shock and abrasion resistance. It is recommended for shock resisting applications such as pneumatic tools, punches, concrete breakers, rivet busters, etc. 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: TS-164. Producer or source: Jessop Steel Company.