This connector is a DC barrel Jack connector which fits with standard 2.1mm DC barrel jack female connector.

This barrel jack plug is great for adding a common connector to the end of our wires. This jack is compatible with 5.5mm barrel jacks that have a 2.1mm center pole diameter. The outer shell unscrews to reveal solder terminals and a crimp strain relief. The outer shell has strain relief as well.

This is a general-purpose connector to be used in a variety of applications where a female 2.1mm DC barrel jack is there to receive DC power. This kind of connector is normally found in the wall DC adaptor.