English standards are classified according to ANSI number
designations. Sprockets engage chains in many different power
transmission and conveyor system. English roller chain and sprockets are
categorized according to ANSI B 29.1M. The number can be used to
identify pitch. The first digits identify the pitch in 1/8"
increments and the last digit is 0 for standard proportions, 1 for
lightweight chain and 5 for roller less bushed chain.