Anchor chain

The anchor chain is a metal chain that connects the anchor to the yacht. It is a critical component of the ground tackle, providing not only the connection but also the weight to keep the anchor shank horizontal, shock absorption from wave action, and abrasion resistance. Unlike an all-rope rode, the chain's weight improves holding power and prevents chafing on the seabed. When selecting a chain, it's essential to match it with the type of anchor and the windlass. Proper anchoring technique requires understanding scope and chain behavior.

Chain size is specified by the diameter of the wire used to make the links, typically in millimeters. For cruising yachts of 10–15 m (33–50 ft), 8–10 mm chain is common; heavier vessels may require 12 mm or more. The length of chain deployed (scope) is crucial: a minimum of 3:1 (chain length to water depth) in calm conditions, and 5:1 to 7:1 in strong winds or waves. Chain is often marked with colored paint or cable ties every 10 meters to monitor scope.

According to Wikipedia, an anchor windlass is a machine that restrains and manipulates the anchor chain, allowing the anchor to be raised and lowered. The chain must match the windlass gypsy in both link size and pitch. Do not confuse the anchor chain with steering chains or chainplates. Regular inspection for wear, rust, and stretched links is essential for safe anchoring.