Anchor chain refers to a special chain that connects the anchor and the hull and transmits the anchor's grip. It is often composed of anchor end links, intermediate links and end links. According to the structure of the chain link, it can be divided into two types: the anchor chain with gear and the anchor chain without gear. The strength of the former is larger than that of the latter. According to the manufacturing method, the anchor chain can be divided into cast steel anchor chain and electric welding anchor chain. The length of the anchor chain is measured in sections, and the standard length of each anchor chain is 27.5m. The internodes are connected with connecting links or connecting shackles. Usually, the chain length of the main anchor on each side of the 10,000-ton ship is about 12 knots.