Terminals are a kind of accessory products used to realize electrical connections, which are classified as connectors in the industry. With the increasing degree of industrial automation and stricter and more precise requirements for industrial control, the amount of wiring terminals has gradually increased. With the development of the electronics industry, more and more terminals are used, and there are more and more types. In addition to PCB terminals, the most widely used terminals include hardware terminals, nut terminals, spring terminals and so on.