In a chain extension, which hardware piece serves as the connector between two chain lengths?

• A. Coupling link
• B. Shackle
• C. Turnbuckle
• D. Clevis

Answer: (A)

In a chain extension, you need a connector that preserves the chain’s strength and load path by joining two chain lengths with a single, continuous link. The coupling link is designed exactly for this purpose: a closed steel link sized to match the chain, so two chain ends can be joined securely and carry the same load rating without introducing a weak point. It maintains the same pitch and alignment as the chain, ensuring the load transfers through the chain rather than through a separate hardware path. This keeps the sling’s geometry and WLL consistent as you extend the chain.

Shackles are for attaching to loads or anchor points and are not meant to join chain ends in a way that maintains a continuous load path. Turnbuckles adjust length or tension and are not used as a chain-to-chain connector. Clevis fittings connect with pins to other hardware and likewise aren’t the standard method to extend chain. Use a coupling link that matches the chain size and grade when extending chain to ensure a safe, reliable connection.