A coaxial electrical connector includes a metallic shell having a tubular section with an axial direction and a soldering leg, a central contacts having a contacting section extending in the axial direction within the tubular section and a dielectric seat molded so as to hold together said metallic shell and the central contact as a unit. The metallic shell defines a filled groove around an inner face thereof and perpendicular to the axial direction. The filled groove is to receive a projection of the dielectric seat during a cool process of a molded process to form the coaxial electrical connector.