Which component is commonly used to connect the ends of a chain in a chain drive?

• A. Roller
• B. Master link
• C. Pin
• D. Sprocket

Answer: (B)

When forming a chain loop in a chain drive, you need a detachable joining element. The master link is designed for this purpose. It is a removable link with side plates that clamp around the ends of the chain and a retaining clip or pin to lock it in place, allowing easy installation and removal without disturbing the other pins. This setup keeps the chain strong, properly aligned, and ready for maintenance or length adjustments. The other parts have different roles: a roller is part of the chain’s contact with the sprocket, not a joining device; a pin holds the chain links together within the chain itself, not used to join the chain ends; and a sprocket is the toothed wheel that drives the chain. So the master link is the component used to connect the ends of a chain.