Patent ID: 7331807

Claim:
Electrical plug-in connection ( 1 ), having a plug part ( 2 ) and a mating plug part ( 3 ), comprising female contact connectors ( 10 ) and male contact connectors ( 9 ) which can be plugged together and produce a large number of electrical connections, whereby the plug part ( 2 ) or the mating plug part ( 3 ) is bearing a union nut ( 4 ) on its body ( 19 , 24 ) being pivot-mounted, which can be screwed to the mating plug part ( 3 ) or the plug part ( 2 ) and secures the plug-in connection ( 1 ) against being disconnected in an undesirable manner, the union nut ( 4 ) having, at both of its ends, an internal thread ( 28 , 7 ) for screwing it to the plug part ( 2 ) and the mating plug part ( 3 ), and the internal threads ( 7 , 28 ) being formed in the opposite direction and having a consistent thread diameter, characterized in that at least one of the two internal threads ( 7 , 28 ) of the union nut ( 4 ) is segmented in a circumferential direction and has on the side facing the front faces ( 31 , 38 ) of the union nut ( 4 ) a first thread segmented turn ( 40 ) having a cross-sectional profile which is different than the thread turns of the external threads ( 6 , 20 ) and cannot be brought into engagement with the thread ( 6 , 20 ) of the mating plug part ( 3 ) or the plug part ( 2 ), whereby the segmented internal thread ( 7 ) respectively ( 28 ) of the union nut ( 4 ) has at least one threaded and one threadless region, which extends in the plug-in direction, wherein its threaded region can be inserted completely into a threadless region of an external thread ( 6 , 20 ) of the associated plug part ( 2 ) or mating plug part ( 3 ) having a complimentary design, and screwing union nut ( 4 ) is impossible as long as its segmented turn ( 40 ) is positioned within the threadless region of the plug part ( 2 ) respectively of the mating plug part ( 3 ).