Attributes . 100 Chain; 30 Teeth; 1 Row of Teeth; Hardened Teeth; 12.643" Outside Dia; 11.959" Pitch Dia; B-Hub One Side; Rough Bore Mount; 1-1/4" Chain Pitch; ANSI Roller Chain Chain Type; No Keyway; Steel Material; 3-15/16" Max Bore . Names