Roller Chain Sprocket; 1/2" Bore; 40 Chain; 14 Teeth; 1 Row of Teeth; Hardened Teeth; 2.49" Outside Diameter; 2.247" Pitch Diameter; B-Hub One Side; Finished Bore Mount; No Bushing; 1/2" Chain Pitch; ANSI Roller Chain; No Keyway; Steel Material