1/2 inch pitch industrial roller chain.
Roller Chain Size Converter
Convert ANSI roller chain sizes such as #25, #35, #40, #50, #60, #80, and #100 into pitch, roller width, roller diameter, and metric dimensions. Handy for checking sprockets, replacement chain, go-karts, machinery, conveyors, and farm equipment.
Convert a roller chain size
Pick a standard ANSI size or enter a pitch to find the closest chain family.
#40 chain is a common 1/2 inch pitch roller chain. Always confirm sprocket tooth width, strand count, and application before replacing chain.
How roller chain numbers convert
Many ANSI roller chain sizes encode the pitch in eighths of an inch. A #40 chain has a pitch of 4/8 inch, which is 1/2 inch or 12.70 mm. A #60 chain has a pitch of 6/8 inch, which is 3/4 inch or 19.05 mm.
The second digit often gives the chain series and roller style. This converter focuses on common single-strand ANSI roller chain dimensions for quick identification.
Use the chart before ordering chain
Pitch is the distance from one pin center to the next. Roller width and roller diameter help separate similar-looking sizes. If an old chain is worn, measure several links and divide by the number of pitches for a cleaner estimate.
For motorcycles, bicycles, leaf chain, metric ISO chain, or double-strand chain, match the full marked chain number rather than pitch alone.
ANSI roller chain size chart
| Size | Pitch | Roller width | Roller diameter | Typical use |
|---|
Roller chain size FAQ
What does #40 chain mean?
#40 roller chain is a common ANSI chain with 1/2 inch pitch. Its roller width and roller diameter are each about 5/16 inch.
What is the pitch of #35 chain?
#35 chain has 3/8 inch pitch, which equals 9.525 mm.
Can I replace chain by matching pitch only?
No. Pitch is the first check, but roller width, sprocket width, roller diameter, tensile rating, strand count, and application also matter.