Attribute Value: 200-2 Chain; 23 Teeth; 2 Rows of Teeth; Hardened Teeth; 19.69" Outside Dia; 18.36" Pitch Dia; B-Hub One Side; Rough Bore Mount; 2-1/2" Chain Pitch; ANSI Roller Chain Type; No Keyway; Steel Material; 5-3/4" Max Bore . Names (Page 1)