Roller Chain Sprocket; 1-7/16" Bore; 50 Chain; 49 Teeth; 1 Row of Teeth; No Hardened Teeth; 10.11" Outside Diameter; 9.755" Pitch Diameter; A-No Hub; Finished Bore Mount; No Bushing; 5/8" Chain Pitch; ANSI Roller Chain; Keyway; Steel Material