Connector or contact head, is the core component of the industrial connector, is the guarantee of industrial connectors for good electrical conductivity, excellent electromagnetic resistance performance guarantee. Industrial connector plug in the socket inserted through mechanical action, and thus make the humpback pin contact and socket contact of mating, the formation of electrical connections, so that current flows through. When the separation of plugs, sockets, contacts disengaged, the circuit is cut off.

Contact with the pieces of performance requirements for small contact resistance, long life plug. So, create access to the most commonly used materials copper and copper alloys such as brass, phosphor bronze, tin bronze, beryllium copper, etc.; other materials iron, mild steel, cobalt, nickel alloys, chromium-nickel alloy, aluminum-nickel alloy. In order to prevent contact corrosion, to maintain good electrical conductivity, the contact surface is usually plated with gold, gold alloy, silver, ~ nickel metal coating. Contacts in some products need to rhodium-plated or tinned.