1. Non standard chains are multi-purpose mechanical foundation components composed of rigid components and flexible systems.

　　Non standard chains include four series: transmission chain, conveyor chain, traction chain, and special professional chain

　　2. A series of metal chain links or rings used to obstruct traffic channels (such as at the entrance of a street, river, or harbor). A chain used for mechanical transportation

　　Non standard chains can be divided into short pitch precision roller chains, short pitch precision roller chains, bent plate roller chains for heavy-duty transmission, cement machinery chains, plate chains, high-strength chains, and high-strength chain rigging series. They are professionally used for engineering matching, manufacturing matching, production line matching, and special environment matching.