Attributes . 40 Chain; 29 Teeth; 1 Row of Teeth; No Hardened Teeth; 4.898" Outside Dia; 4-5/8" Pitch Dia; B-Hub One Side; Rough Bore Mount; 1/2" Chain Pitch; ANSI Roller Chain Type; No Keyway; Steel Material; 2-1/4" Max Bore . Names