Swissmetal alloy SM158N (Boillat 61B) is a free-machining brass with both machinability and cold workability. The alloy has been called heavy-leaded brass, clock brass, and engraver’s brass. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, and joining. Filing Code: CU-683. Producer or source: Swissmetal Metalworks Ltd, Plant Boillat.