A coaxial plug connector with an adjustable length is disclosed that can be used for adjusting the phase of a coaxial cable. The outer conductor of the coaxial plug connector is on the connection side received in the outer conductor of the coaxial plug connector on the cable-side by a press fit. The inner conductor of the plug connector can be displaced in an insulator support member by at least the adjustment distance of the outer conductor of the connector on the connection side.