ALLCAST 41A is an aluminum-silicon-copper casting alloy. It responds to an age-hardening heat treatment and is recommended for light weight, high strength, pressure-tight castings. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive and shear strength as well as fatigue. It also includes information on high temperature performance as well as heat treating, machining, and joining. Filing Code: Al-175. Producer or source: Apex Smelting Company.