Attributes . 50-3 Chain; 25 Teeth; 3 Rows of Teeth; Hardened Teeth; 5.323" Outside Dia; 4.987" Pitch Dia; B-Hub One Side; Rough Bore Mount; 5/8" Chain Pitch; ANSI Roller Chain Type; No Keyway; Carbon Steel Material; 2-1/2" Max Bore . Names