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When a double strand roller chain snaps mid-project or needs to be shortened for a custom drive build, finding the right master link is the difference between a clean repair and hours of frustration. These double strand roller chain master connecting links are designed for mechanics, machine builders, and DIY power-transmission enthusiasts who need a dependable, drop-in rejoining solution for double-row chain drives.
Each link is constructed from carbon steel with a zinc-plated finish for corrosion resistance, and is engineered to match the pitch and roller dimensions of standard double strand (duplex) roller chains. Available models span from 06B-2 through 40B-2 and 06C-2 through 40A-2, covering pitch ranges of approximately 9.525 mm (3/8 in) for 06-series up to 50.8 mm (2 in) for 40-series. Sold in packs of 1 or 5 pieces depending on the selected variant.
Typical use cases include rejoining double strand conveyor chains on agricultural equipment, reconnecting duplex drive chains on go-karts and mini bikes, and replacing worn master links on industrial roller chain drives in workshop machinery — all scenarios where a correctly sized double strand master link is essential for safe, efficient power transfer.
| Product Type | Double Strand (Duplex) Roller Chain Master Connecting Link |
|---|---|
| Chain Series | 06B-2, 06C-2, 08A-2, 08B-2, 10A-2, 10B-2, 12A-2, 12B-2, 16A-2, 16B-2, 20A-2, 20B-2, 24A-2, 24B-2, 28A-2, 28B-2, 32A-2, 32B-2, 40A-2, 40B-2 |
| Strand Count | 2 (Duplex / Double Strand) |
| Pitch Range | Approx. 9.525 mm (3/8") — 50.8 mm (2") depending on model |
| Material | Carbon Steel |
| Surface Finish | Zinc-Plated |
| Standard | ISO 606 / DIN 8187 (B-series); ANSI-compatible (A-series) |
| Retention Type | Spring Clip (Cotter Pin Style) |
| Pack Quantity | See variant options |
| Weight per Unit | See variant options |
Match the model number on your existing chain. The number stamped or printed on the chain side plates (e.g., 08B-2) corresponds directly to the master link model you need. The prefix indicates pitch size and the suffix "-2" confirms it is a double strand chain. If unsure, measure the pitch (center-to-center distance between two consecutive pins) and compare to the pitch range listed in the specifications above.
A-series (e.g., 08A-2) follows ANSI standards and is common in North American machinery, while B-series (e.g., 08B-2) follows ISO/DIN standards and is more prevalent in European and international equipment. Both are available in this listing — select the series that matches your existing chain. Mixing A and B series links with the wrong chain will result in improper fit.
These carbon steel master links are designed to match the tensile strength rating of their corresponding chain series. For heavy-duty or high-cycle industrial applications, always verify that the master link's rated breaking load meets or exceeds your drive system's working load requirements. Consult your equipment manual for the minimum chain tensile strength specification.
Yes — the zinc-plated finish provides moderate corrosion resistance suitable for indoor machinery, workshop environments, and light outdoor use. For applications with continuous moisture exposure, chemical contact, or marine environments, consider stainless steel chain links instead, as zinc plating has limits in highly corrosive conditions.
No. Each master link is sized for one specific chain model. Mixing chain sizes or using a mismatched master link creates a weak point in the drive and is a safety hazard. Always use a master link that exactly matches the chain model number on both sides of the join.
If you need a single repair, the 1-piece option is ideal. The 5-piece pack offers better value per link and is recommended if you maintain multiple machines, run a workshop, or want to keep spares on hand for future repairs. For larger chain sizes (20A-2 and above), only the 1-piece option is available per variant.
Thread the master link pin through the chain ends and the outer plate, then slide the spring clip into the groove on the pin with the closed end facing the direction of chain travel. Use needle-nose pliers or a clip installation tool to seat the clip fully. Ensure the clip is fully engaged in both pin grooves before running the chain under load.
