Chain Pitch Converter
Look up roller chain pitch, width, and pin diameter by chain number in inches and millimeters.
Complete specs for all standard ANSI roller chain sizes.
Select a chain number — see pitch and specifications.
Chain Specifications
Roller chain is identified by ANSI chain number.
Chain numbering system:
- First digit(s) = pitch in 1/8 inch increments
- Last digit: 0 = standard, 1 = lightweight, 5 = bushing
Example: Chain #40 = 4/8 inch = 0.5 inch pitch
Common chain sizes:
| Chain # | Pitch (in) | Pitch (mm) | Roller Width (in) | Tensile (lbs) |
|---|---|---|---|---|
| #25 | 0.250 | 6.35 | 0.125 | 780 |
| #35 | 0.375 | 9.525 | 0.188 | 1,760 |
| #40 | 0.500 | 12.70 | 0.312 | 3,125 |
| #41 | 0.500 | 12.70 | 0.250 | 2,000 |
| #50 | 0.625 | 15.875 | 0.375 | 4,880 |
| #60 | 0.750 | 19.05 | 0.500 | 7,030 |
| #80 | 1.000 | 25.40 | 0.625 | 12,500 |
| #100 | 1.250 | 31.75 | 0.750 | 19,500 |
| #120 | 1.500 | 38.10 | 1.000 | 28,000 |
Double-strand chains (e.g., #40-2) have roughly 1.7x the tensile strength.