When a chain extension is required, what item of equipment is used to connect to two lengths of chain?

• A. Shackle
• B. Coupling link
• C. Turnbuckle
• D. Snap hook

Answer: (B)

Connecting two chain lengths requires a device specifically designed to join ends while maintaining the intended load path and strength. A coupling link is built to be a secure, short, continuous connector that accepts the ends of two chains and distributes the load evenly through a single, rated link. This makes it the proper choice for a chain extension.

Other options aren’t ideal for this purpose: a shackle is a general-purpose fastener best used to link chain to loads or anchor points, not to form a single, joined chain length; a turnbuckle is meant to adjust length or tension between fixed points and would introduce an adjustable joint that can loosen under load; a snap hook is designed for quick connections to rings or eyes and can fail to maintain a secure connection under dynamic loading when used to join two chain lengths.