BUNTING Alloy 907 is a cast copper-tin alloy (tin bronze) recommended for severe service requirements. It is used widely for bearings and gears. It is a standard alloy for the manufacture of cast gear blanks and has long been known as Phosphor Gear Bronze. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive strength as well as fracture toughness. It also includes information on corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: Cu-328. Producer or source: NL Industries Inc., Bearing Division.