Roller Chain Sprocket; 1-1/8" Bore; 60 Chain; 18 Teeth; 1 Row of Teeth; No Hardened Teeth; 4-45/64" Outside Diameter; 4.319" Pitch Diameter; B-Hub One Side; Finished Bore Mount; No Bushing; 3/4" Chain Pitch; ANSI Roller Chain; Keyway; Steel Material