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When a worn or undersized drive chain causes slippage, skipped links, or unexpected downtime, the fix starts with choosing the right replacement. Makers, hobbyists, and light-industrial operators who need a compact yet dependable chain for low-to-medium load applications will find the #25 (04C) single-strand roller chain a go-to solution.
This listing covers a single-strand #25 roller chain with a 6.35 mm (1/4 in) pitch, supplied in a 0.5 m (approximately 19.7 in) length containing 82 links (25H-82L). The chain is constructed from carbon steel with precision-formed rollers and press-fit pins, delivering consistent engagement across compatible sprockets.
Typical use cases include go-kart and mini-bike final drives, small conveyor systems requiring a #25 pitch chain, DIY power-transmission projects such as motorized bicycles or robotics platforms, and light agricultural or workshop equipment where a compact 6.35 mm pitch roller chain is specified.
Matches the ANSI #25 / ISO 04C standard exactly, ensuring drop-in compatibility with any conforming sprocket without modification.
Compact single-row design keeps weight and width to a minimum — ideal for space-constrained drive systems on go-karts, mini bikes, and robotics.
Pre-cut to 82 links (≈ 0.5 m / 19.7 in), ready to install or trim to your required loop length with a standard chain breaker tool.
Hardened carbon steel components resist wear under repeated load cycles, maintaining consistent pitch accuracy over extended service life.
Precision-formed rollers seat cleanly on sprocket teeth, reducing vibration and noise — important for indoor workshop and hobby applications.
Works with standard #25 master links (sold separately) for quick loop assembly. Cut to length with any chain breaker compatible with 6.35 mm pitch chains.
| Chain Standard | ANSI #25 / ISO 04C / 25H |
|---|---|
| Pitch | 6.35 mm (1/4 in) |
| Strand | Single |
| Number of Links | 82 (25H-82L) |
| Length | 0.5 m (approx. 19.7 in) |
| Roller Diameter | See variant options |
| Inner Width | See variant options |
| Material | Carbon steel |
| Finish | Natural / uncoated |
| Breaking Load | See variant options |
| Weight | Approx. 0.15 kg per 0.5 m |
This chain conforms to the ANSI #25 / ISO 04C standard with a 6.35 mm (1/4 in) pitch. Any sprocket labeled #25, 04C, or 25H with the same pitch will be compatible. Confirm the sprocket's tooth profile and bore size match your shaft before ordering.
This listing supplies one 0.5 m (82-link) section. For longer runs, order multiple sections and join them with standard #25 master links (sold separately). Always measure your required loop length — center-to-center distance × 2 plus sprocket circumference — before purchasing.
You will need a chain breaker tool rated for #25 / 6.35 mm pitch chains to push out pins cleanly. To close the loop, use a #25 master link and a pair of snap-ring pliers or a master-link clip tool. No welding or special equipment is required.
Standard ANSI #25 single-strand roller chain has a typical minimum breaking load of approximately 3.1 kN (700 lbf). Actual working load limits depend on speed, lubrication, and sprocket alignment. For high-load or high-speed applications, consider upgrading to a #35 or #40 chain.
Yes. Like all roller chains, the #25 chain performs best when lubricated regularly with a chain-specific oil or spray lubricant. Lubrication reduces pin-bushing wear, prevents rust, and extends service life — especially in outdoor or high-cycle environments.
This chain is made from carbon steel with a natural finish and is not inherently corrosion-resistant. For wet or outdoor environments, apply a rust-inhibiting chain lubricant regularly. If corrosion resistance is a primary requirement, consider a stainless steel #25 chain variant.
Yes — the #25 roller chain is one of the most common drive chains for go-karts, mini bikes, and small motorized vehicles. Verify that your engine sprocket and rear axle sprocket are both rated for #25 chain, and ensure the chain length suits your wheelbase and sprocket center distance.
