The anchor chain is formed by a plurality of chain links, and the size is expressed by a chain diameter of about (mm). According to whether there is a support in the middle of the link, it is divided into a chain anchor chain and a non-stop anchor chain. The anchor chain can be made by forging, casting and welding. The marine anchor chain consists of a number of "shackles", each of which is 25.0 to 27.5 meters long, and is connected by links or shackles between the nodes. After the anchor is twisted, the chain is stored in the chain compartment of the bow. The specifications of the anchor chain are calculated according to the ship construction standards.