66566-4 by TE Connectivity is a standard circular contacts designed for reliable performance in electronic applications. It is widely used in industrial, automotive, and power management systems.

Connector and interconnect products facilitate the joining of electrical or fiber optic conductors & cables. An enormous variety of styles are available, to accommodate most any application; banana plugs for lab equipment, coaxial connectors for RF, modular plugs for network and phone systems, spade and ring terminals for connecting discrete wires to terminal blocks, terminal blocks, sockets for transistors and integrated circuits, standard AC power connectors, headphone plugs and jacks, high-voltage connectors, USB connectors, and many, many more.