Roller Chain Sprocket; 2-15/16" Bore; 140 Chain; 12 Teeth; 1 Row of Teeth; Hardened Teeth; 7.581" Outside Diameter; 6.762" Pitch Diameter; B-Hub One Side; Finished Bore Mount; No Bushing; 1-3/4" Chain Pitch; ANSI Roller Chain; Keyway; Steel Material