Roller Chain Sprocket; 1-1/8" Bore; 60 Chain; 39 Teeth; 1 Row of Teeth; No Hardened Teeth; 9.74" Outside Diameter; 9.321" Pitch Diameter; B-Hub One Side; Finished Bore Mount; No Bushing; 3/4" Chain Pitch; ANSI Roller Chain; Keyway; Steel Material