Abstract: Coaxial plug connector with snap lock for the communications technology, especially in motor vehicles,comprising a plug (1) which carries a locking device (10) on the outside, and a jack (21) with locking means (27) on the outside surface, whereby, upon completing the plug connection in the direction of the plug-in center line (14), the sleeve (5) of the plug (1) and the outer conductor of the jack (21) on the one hand, and the locking device (10) and the locking means (27) on the other mesh with each other, and, with respect to the inner conductor, contact (6) and mating contact (25x) mesh with each other also. The locking device (10) is a latching spring which is fixed at a location (9) on the housing (2) of the plug (1) in the vicinity of the dielectric bushing (8) and extends alongside the sleeve (5) with at least one finger (12, 13), and at the tip of the fingers (12, 13) has a protrusion (16) which is oriented toward the plug-in center line (14).