Abstract: A plug connector (11, 12, FIG. 1) has insulators (16,26) that hold male or female contacts (13, 14, FIG. 3) received in boreholes (19, 29, FIGS. 4A, 4B)). A rear insulator holds a male or female contact (13, 14), which receives cables (45, 55, FIG. 3). The boreholes (19, 29) form fingers (78, 98, FIGS. 4A and 6) that can be radially spread apart to detachably hold the connector contacts (13, 14) in a preliminary locking manner. The plug connector also has a front insert (60, 80) with a front borehole (65, 85) aligned with the rear boreholes (19, 29) and being able to be placed in a non-detachable preliminary locking position that makes possible the attachment of the connector contacts (13, 14) and in a final locking position that holds the connector contacts (13, 14) in a non-releasable fashion.