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When a worn or snapped drive chain brings your equipment to a halt, finding the right replacement fast is critical. Whether you're a maintenance technician keeping industrial conveyors running, a maker building a custom power-transmission rig, or a repair enthusiast restoring a vintage machine, these roller chains are engineered to match standard ISO/BS specifications so you can get back up and running without guesswork.
This listing covers simplex (single-strand) and duplex (double-strand) roller chains in four common models — 06B, 06C, 08A, and 08B — with two pitch options: 3/8" (9.525 mm) and 1/2" (12.7 mm). Chain sections are available in 1.5-meter lengths, and matching full buckle (master link) and half buckle (offset link) connectors are sold individually so you can cut to length and join cleanly. Material is carbon steel with a zinc-plated or natural finish depending on variant; inner plate width and roller diameter conform to ISO 606 / BS 228 standards.
Typical use cases include bicycle-style drive systems, light industrial conveyor lines, agricultural equipment drives, go-kart and mini-bike power trains, and 3D-printer or CNC gantry builds requiring precise pitch-matched chain. Long-tail searches this product covers: "06B simplex roller chain 1.5m", "08B duplex drive chain replacement", "#40 chain master link connector", and "ISO 606 roller chain half buckle".
| Chain Standard | ISO 606 / BS 228 |
|---|---|
| Available Models | 06B, 06C, 08A, 08B |
| Strand Type | Simplex (single) & Duplex (double) |
| Chain Pitch — #35 Series | 3/8" (9.525 mm) |
| Chain Pitch — #40 Series | 1/2" (12.7 mm) |
| Section Length | 1.5 m (approx. 59.1 in) |
| Connector Types | Full Buckle (master link), Half Buckle (offset link) |
| Material | Carbon steel |
| Surface Treatment | See variant options |
| Inner Plate Width | See variant options |
| Roller Diameter | See variant options |
| Breaking Load | See variant options |
| Lubrication | Pre-lubricated; periodic re-lubrication recommended |
The model number encodes the pitch and strand count. 06B and 06C are both 3/8" (9.525 mm) pitch — 06B is the most common BS/ISO variant while 06C uses a slightly different inner plate width; check your sprocket markings to confirm. 08A and 08B are both 1/2" (12.7 mm) pitch — 08A follows the ANSI/ASA dimensional standard while 08B follows the BS/ISO standard. Match the model stamped on your existing chain or sprocket.
Simplex (single-strand) chain has one row of rollers and is used for standard power-transmission drives. Duplex (double-strand) chain has two parallel rows of rollers sharing the same pins, roughly doubling the load capacity at the same pitch. Use duplex when your drive requires more torque than a simplex chain of the same pitch can handle, without switching to a larger pitch.
A full buckle (master link) is used when your chain loop has an even number of links — the two open ends meet plate-to-plate and the master link clips straight across. A half buckle (offset link) is needed when your loop requires an odd number of links — it offsets the inner and outer plates by half a pitch so the chain closes correctly. Measure your required loop length carefully before choosing.
Breaking load varies by model and strand count — refer to the ISO 606 specification for your specific model (e.g., 06B simplex minimum breaking load is typically around 9.0 kN; 08B simplex is typically around 17.8 kN). The carbon steel construction with surface treatment provides adequate corrosion resistance for sheltered or indoor environments. For prolonged outdoor or wet exposure, apply a chain lubricant rated for outdoor use and inspect regularly for rust.
No. Chain pitch must match sprocket pitch exactly. 06B chain has a 9.525 mm pitch and will not seat correctly on an 08B sprocket designed for 12.7 mm pitch. Always match the chain model to the sprocket model. If you are unsure, measure the center-to-center distance between three consecutive roller centers and divide by two — that gives you the pitch in mm.
Use the standard chain-length formula: L = 2C/p + (N₁ + N₂)/2 + p(N₂ − N₁)²/(4π²C), where C is center distance, p is pitch, and N₁/N₂ are sprocket tooth counts. Round up to the nearest whole link. If the result is an odd number of links, you will need a half buckle connector. The 1.5 m sections in this listing contain approximately 157 links for 9.525 mm pitch or 118 links for 12.7 mm pitch — order enough sections to cover your calculated length plus a few spare links.
Chains are pre-lubricated at the factory. For ongoing maintenance, apply a light machine oil or dedicated chain lubricant to the inner plates and rollers every 50–100 operating hours, or more frequently in dusty or wet conditions. Wipe off excess to prevent dirt buildup. Check tension regularly — a chain that is too loose will skip; one that is too tight will accelerate sprocket and bearing wear. Replace the chain when elongation (wear stretch) exceeds 1–2% of nominal pitch length over a 12-link span.
