Roller Chain Sprocket; 1" Bore; 40 Chain; 13 Teeth; 1 Row of Teeth; No Hardened Teeth; 2-21/64" Outside Diameter; 2.089" Pitch Diameter; B-Hub One Side; Finished Bore Mount; No Bushing; 1/2" Chain Pitch; ANSI Roller Chain; Keyway; Steel Material