Abstract: An electrical connector incorporating a male shell having a cylindrical metal body in which is lodged at least one contact of a first type, a female shell having a cylindrical metal body in which is lodged at least one contact of a second type which is to cooperate with the contact of the first type, an assembly nut (3) freely rotatable mounted on one of the shells and becoming fixed by rotation on the outer surface of the other shell and a means to prevent the accidental uncoupling of the assembly nut comprising a radial set of teeth (7) carried either by the assembly nut or by the shell carrying the nut and directed toward the other of the two elements and by a means cooperating with the set of teeth and fixed on the other element.