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When a worn or snapped drive chain brings your equipment to a halt, finding the right replacement in the right length shouldn’t be another obstacle. This listing covers 04C, 05B, and 06C roller chains — three of the most widely used small-pitch transmission chain standards — along with their matching full buckle and half buckle connector links, giving makers, repair technicians, and workshop operators a single source for the chain and the joining hardware they need.
Each chain is constructed from carbon steel with a zinc-plated or natural steel finish, featuring precision-punched inner and outer plates, hardened rollers, and press-fit pins. Pitch sizes span the 04C (6.35 mm / 0.25 in), 05B (8 mm / 0.315 in), and 06C (9.525 mm / 0.375 in) standards. Cut lengths are available from 0.5 m (≈ 19.7 in) up to 10 m (≈ 393.7 in), and a double-row 240-section option is stocked for higher-load applications. Connector links are sold individually or in packs of 10 or 50.
Typical use cases include small engine drives on go-karts and mini bikes, conveyor and feeder mechanisms in workshop automation, agricultural equipment chain replacement, and bicycle or e-bike drivetrain repair where ISO/DIN-compatible roller chain is specified. The 04C full buckle connector is also a popular spare part for 3D printer filament-drive and CNC axis assemblies that use miniature roller chain.
| Chain Standard | 04C (ISO/DIN), 05B (ISO), 06C (ISO/ANSI 35) |
|---|---|
| Pitch — 04C | 6.35 mm (0.250 in) |
| Pitch — 05B | 8.00 mm (0.315 in) |
| Pitch — 06C | 9.525 mm (0.375 in) |
| Roller Diameter | See variant options |
| Inner Width | See variant options |
| Plate Material | Carbon steel |
| Surface Finish | Zinc-plated / natural steel |
| Available Chain Lengths | 0.5 m, 1 m, 1.5 m, 5 m, 10 m; Double row 240 sections |
| Connector Types | Full buckle (spring clip), Half buckle (cotter pin) |
| Packing Quantity | 1 pcs, 10 pcs, 50 pcs |
| Tensile Strength | See variant options |
| Weight per Meter | See variant options |
Match the chain size to your sprocket’s pitch. Measure the distance between the centers of two adjacent roller pins on your existing chain: 6.35 mm (1/4 in) = 04C; 8 mm = 05B; 9.525 mm (3/8 in) = 06C. If you’re replacing a worn chain, check the sprocket teeth for the stamped size code or consult the equipment manual.
A full buckle (spring clip) connector uses a U-shaped spring clip to retain the outer plate — it can be installed and removed without tools, making it ideal for chains that need frequent adjustment or replacement. A half buckle (cotter pin) connector uses a split cotter pin through the pin ends for retention, which is more resistant to vibration and is preferred in higher-speed or higher-load drives where the spring clip could work loose.
Yes — as long as both lengths are the same chain size (e.g., both 04C), you can join them using the matching connector link. Order the full buckle or half buckle connector in the same size as your chain. Mixing different pitch sizes (e.g., 04C with 05B) is not compatible.
The zinc-plated finish provides light corrosion resistance suitable for covered outdoor use or occasional moisture exposure. For continuously wet, marine, or chemically aggressive environments, apply a chain lubricant rated for those conditions and inspect the chain regularly. Stainless steel chain would be a better long-term choice for harsh outdoor exposure.
A roller chain breaker (chain tool) is the recommended tool — it presses the pin out cleanly without deforming the plates. In a pinch, a bench vise and punch can be used, but a dedicated chain breaker gives a cleaner result and reduces the risk of damaging adjacent links. Chain breakers sized for small-pitch chains (04C–06C) are widely available at hardware and bicycle shops.
This variant is a double-strand (duplex) roller chain loop pre-counted to 240 link sections. Double-row chains carry roughly twice the load of a single-strand chain of the same pitch and are used in drives where a wider sprocket and higher torque transmission are required. Confirm your sprocket is designed for duplex chain before ordering this variant.
Apply a light machine oil or dedicated chain lubricant to the inner plates and rollers during initial installation and at regular service intervals (typically every 50–100 operating hours for light-duty applications). Wipe off excess lubricant to prevent dirt accumulation. Check chain tension periodically — a chain that has elongated more than 3% of its original length should be replaced to avoid accelerated sprocket wear.
