The grade of marine anchor chain is divided into three type M1, M2 and M3. Add A Before the corresponding code (such as AM2) to indicate that is stud link marine anchor chain, and B to indicate that is studless chain (there are two levels of BM1 and BM2). The higher the steel grade, the greater the tensile strength. AM1 grade anchor chain steel is killed steel, AM2, AM3 grade anchor chain steel is fully sedative fine grain treated steel. For the same ship, if a strong steel is used, the size of the link can be appropriately reduced.