The connector, usable particularly in the car industry, comprises two elements (10, 12) which may coupled and of which one of them carries a tapped rotary locking ring (16) which cooperates with a threaded portion of the other element, the ring having distributed internal teeth which have each a ridge separating a slight slope face from a steep slope face with respect to the circumferential direction. The element which carries the ring is also provided with elastic blades built in at one end and of which the other end cooperates with the bottom of the teeth in order to form a ratchet opposed to the rotation of the ring (16) in the unscrewing direction. Each element is directed from the unbedding in a direction such that it is tensioned by the action of the spring (16) upon unlocking. The free end has an elbow directed radially towards the outside and of which the angle is of the same order as that between the faces of the teeth, the steep slope face bearing against the elbow upon unlocking.
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