Roller Chain Sprocket; 2-1/4" Bore; 120 Chain; 17 Teeth; 1 Row of Teeth; No Hardened Teeth; 8.924" Outside Diameter; 8.163" Pitch Diameter; B-Hub One Side; Finished Bore Mount; No Bushing; 1-1/2" Chain Pitch; ANSI Roller Chain; Keyway; Steel Material