The level of the lifting chain is G80, so what exactly does he represent? G is the meaning of English Grade. For the chain, that is, the test load per square mm per square mm of the chain ring radial section is 80 kg. The material uses 20mn2 alloy structure steel. This type of steel has a high tensile strength after the appropriate metal thermal treatment. The application of the lifting chain is widely used. It can be applied not only to the ring chain crane, but also can be used in various hand -streaming gourds, ring chain electric gourds, which are strong and durable.