Roller Chain Sprocket; 7/8" Bore; 40 Chain; 11 Teeth; 1 Row of Teeth; No Hardened Teeth; 2.003" Outside Diameter; 1.775" Pitch Diameter; B-Hub One Side; Finished Bore Mount; No Bushing; 1/2" Chain Pitch; ANSI Roller Chain; Keyway; Steel Material