Roller Chain Sprocket; 6-1/2" Bore; 240-2 Chain; 18 Teeth; 2 Row of Teeth; No Hardened Teeth; 18.81" Outside Diameter; 17.276" Pitch Diameter; B-Hub One Side; Finished Bore Mount; No Bushing; 3" Chain Pitch; ANSI Roller Chain; Keyway; Steel Material