Below are complete roller chain dimension charts for ANSI single, double & triple strand roller chains. The most important roller chain dimensions to measure for identifying your chain is the Pitch (P), Roller Diameter (d1) and Inner Width (b1). These three dimensions will help you determine what roller chain size you have. Dimensions not quite matching? You may have a Metric roller chain or Non-Standard roller chain.
Roller chain dimensions for standard size ANSI roller chain. This is the most common roller chain.
* Rollerless chain. d1 = Bushing diameter