Abstract: For a plug connector having a plug-in side and a conductor-connecting side for a coaxial cable, it is proposed that an insulating body with an electrical contact element is disposed in a sleeve-shaped plug-in part, the said insulating body having tongues which are spread apart and are separated by slots and which extend from an annular groove to the end of the insulating body, gradations which are forced into the insulation of the electrical middle conductor being provided on the inside of the tongues, and the electrical contact element being held in a centred manner in a receiving bore in the insulating body.