This 22BH Sprocket replaces Sumitomo part number 159679A1. Sprockets are made from quality cast steel with the external tooth profiles deep induction hardened for maximum durability. Sprocket segments are forged and thoroughly hardened for extended wear life. Check it against the part you are replacing before ordering, or ask the PartsForMachines team. Covered by a 12-month warranty against breakage; wear is not covered.