A connector for connecting a welding torch, where the connector body and the house are made of insulating material and designed as a unit in one piece connected by a rear wall. The connector includes an insert made of electrically conductive material carrying a threaded surface made of electrically conductive material and a contact surface. The insert can be fitted in a nest formed by a side surface of the connector body part and a surface of the house part opposite to the side surface. An opening on the sidewall of the house part provides access to the side surface of the insert for connecting the side surface to a current, and the insert is secured rotationally in the nest.