1. Non standard chain is a multi-purpose mechanical basic part of flexible system composed of rigid components.

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

2. A series of often metallic links or rings used to obstruct the passage of traffic, such as in a street, at the entrance of a river or harbor

Non standard chains can be divided into short pitch precision roller chains, short pitch precision roller chains, bent roller chains for heavy-duty transmission, chains for cement machinery, plate chains, high-strength chains, high-strength chain rigging series, which are specialized in supporting engineering, manufacturing, production lines and special environments.