Roller Chain Sprocket; 1-3/4" Bore; 12B-1 Chain; 21 Teeth; 1 Row of Teeth; Hardened Teeth; 5.426" Outside Diameter; 5.032" Pitch Diameter; B-Hub One Side; Finished Bore Mount; No Bushing; 3/4" Chain Pitch; ISO Roller Chain; Keyway; Steel Material

Roller Chain Sprocket; 1-3/16" Bore; 12B-1 Chain; 21 Teeth; 1 Row of Teeth; Hardened Teeth; 5.426" Outside Diameter; 5.032" Pitch Diameter; B-Hub One Side; Finished Bore Mount; No Bushing; 3/4" Chain Pitch; ISO Roller Chain; Keyway; Steel Material

Roller Chain Sprocket; 1-7/16" Bore; 12B-1 Chain; 21 Teeth; 1 Row of Teeth; Hardened Teeth; 5.426" Outside Diameter; 5.032" Pitch Diameter; B-Hub One Side; Finished Bore Mount; No Bushing; 3/4" Chain Pitch; ISO Roller Chain; Keyway; Steel Material

Roller Chain Sprocket; 12B-1 Chain; 21 Teeth; 1 Row of Teeth; Hardened Teeth; 137.82MM Outside Diameter; 127.82MM Pitch Diameter; B-Hub One Side; Rough Bore Mount; No Bushing; 19.05MM Chain Pitch; ISO Roller Chain; No Keyway; Steel Material

Roller Chain Sprocket; 1-5/8" Bore; 12B-1 Chain; 21 Teeth; 1 Row of Teeth; Hardened Teeth; 5.426" Outside Diameter; 5.032" Pitch Diameter; B-Hub One Side; Finished Bore Mount; No Bushing; 3/4" Chain Pitch; ISO Roller Chain; Keyway; Steel Material