The invention relates to an electrical connector, comprising a connector part and a mating connector part which can be plugged together, and a coupling ring, carried by the connector part, for screwing the connector part with a threaded sleeve of the mating connector part. An outer thread of the threaded sleeve and a correspondingly configured inner thread of the coupling ring have at least one unthreaded section each in the direction of insertion. The respective unthreaded and threaded sections are configured and arranged in such a manner that the threaded sections of the coupling ring and the threaded sleeve can be inserted in the respective unthreaded section of the other connector part in order to plug the connector and mating connector together. The connector according to the invention is characterized by at least one raised annular collar section in front of at least one unthreaded section of the coupling ring in the direction of insertion, said annular collar section allowing the coupling ring to be rotated, when the connector is plugged together, once the annular collar section has passed the unthreaded section of the thread of the threaded sleeve.