Attributes . 100-2 Chain; 70 Teeth; 2 Rows of Teeth; Hardened Teeth; 28.584" Outside Dia; 27.861" Pitch Dia; C-Hub Both Sides; Rough Bore Mount; 1-1/4" Chain Pitch; ANSI Roller Chain Type; No Keyway; Carbon Steel Material; 5" Max Bore . Names