In similar products, the chain product series shall be divided according to the basic structure of the chain, that is, according to the shape of the elements, the parts and positions that mesh with the chain, the size proportion between the parts, etc. There are many kinds of chains, but their basic structures are only the following, and the others are all their deformations.

Chains are usually metal links or rings, which are mostly used for mechanical transmission and traction. A chain (as in a street, river, or entrance to a harbor) used to obstruct traffic. The chain can be divided into short pitch precision roller chains; Short pitch precision roller chain; Curved roller chains for heavy duty drives; Chain for cement machinery, plate chain; High strength chain.