Attributes . 50-3 Chain; 21 Teeth; 3 Rows of Teeth; Hardened Teeth; 4.522" Outside Dia; 4.194" Pitch Dia; B-Hub One Side; Rough Bore Mount; 5/8" Chain Pitch; ANSI Roller Chain Chain Type; No Keyway; Steel Material; 2-3/8" Max Bore . Names