Roller Chain Sprocket; 1-1/4" Bore; 40 Chain; 34 Teeth; 1 Row of Teeth; No Hardened Teeth; 5.696" Outside Diameter; 5.419" Pitch Diameter; B-Hub One Side; Finished Bore Mount; No Bushing; 1/2" Chain Pitch; ANSI Roller Chain; Keyway; Steel Material