Roller Chain Identification (ANSI B29.1)
ANSI roller chain is identified by a numbering system where the first digit(s) indicate the pitch in 1/8-inch increments.
| ANSI Size | Pitch | Roller Dia | Inner Width |
|---|---|---|---|
| #25 | 0.250" | 0.130" | 0.125" |
| #35 | 0.375" | 0.200" | 0.188" |
| #40 | 0.500" | 0.312" | 0.312" |
| #50 | 0.625" | 0.400" | 0.375" |
| #60 | 0.750" | 0.469" | 0.500" |
| #80 | 1.000" | 0.625" | 0.625" |