Attributes . 50-3 Chain; 23 Teeth; 3 Rows of Teeth; Hardened Teeth; 4.923" Outside Dia; 4.59" Pitch Dia; B-Hub One Side; Rough Bore Mount; 5/8" Chain Pitch; ANSI Roller Chain Chain Type; No Keyway; Steel Material; 2-1/2" Max Bore . Names