Anchor chain refers to a special chain that connects the anchor and the hull and transmits the anchor grip. Often composed of anchor chain links, intermediate links and end links. According to the structure of the link, it can be divided into two types: the chain anchor chain and the non-stop anchor chain. The strength of the former is larger than that of the latter; according to the manufacturing method, the anchor chain can be divided into a cast steel anchor chain and an electric welding anchor chain. The length of the chain is in knots and the standard length of each chain is 27.5m. The joints are connected by a connecting link or a connecting shackle. Usually, the main anchor of each 10,000-ton wheel has a chain length of about 12 knots.