The male connector (8) for medical use, comprising a pipe (10) of the central opening, the pipe (10) being fixed by means of annular link means (11) with a tightening ring (9), peripheral provided with at least one internal helical thread (16), the ring covering the central duct to the vicinity of its free end adapted to cooperate with the female connector, characterized in that the at least one internal helical thread (16) is present in the form of an intermittent succession of elements (19) projecting offset in the longitudinal axis of the connector (8) so that none of them is covered, and in that the connecting means are in the form of a plurality of bridges positioned at right angles to the spaces which have remained free between the projecting elements along the longitudinal axis.
