Attributes . 50-3 Chain; 19 Teeth; 3 Rows of Teeth; Hardened Teeth; 4.121" Outside Dia; 3-51/64" Pitch Dia; B-Hub One Side; Rough Bore Mount; 5/8" Chain Pitch; ANSI Roller Chain Chain Type; No Keyway; Steel Material; 2-1/8" Max Bore . Names