Abstract: An anchor nut-cage fixing system is provided for positioning on a metal sheet from one of the faces of this metal sheet with a view to receiving bolts presented from this same face and comprising: a nut (1) with wings adapted for cooperating with an elongate hole (3) formed in the metal sheet (4); a plastic material cage (5) split by windows (6) and connected to an external collar (7). This collar is covered by a flat metal cap (9) perforated so as to let the bolts pass therethrough and having axially bent flanges (12) whose axial height is equal to or slightly less than the thickness of the collar, one at least of these flanges being bent to a little more than 90.degree. so as to imprison the collar.

Abstract: There is provided a means for fixing an object to a blind metal sheet (1) by fitting into a square hole (2) provided in this metal sheet, a cage (3) containing a threaded part (7), then by causing a complementary threaded part to coact with this part. The hole is square, the cage has the shape of an octagonal prism provided laterally with four longitudinal windows (8) and the threaded part comprises four radial tabs (9) adapted to slide jointingly in said windows (8), means being provided, such as thinned-down portions (12), for making possible a rotation through 45.degree. of said part (7) after its axial introduction with the cage into said hole (2).

Abstract: A cage for fixing an object by screwing it to a rectangular hole of width a having parallel edges and provided in a metal plate accessible from only one side, comprises a cylindrical socket extended by a collar, the dimension of the socket in a first transverse direction being at most equal to a and two tongues extending from this socket in the transverse direction perpendicular to the preceding one so as to form with the collar two slides adapted to overlap the edges after axial insertion of the cage into the slit, then rotation of this cage by a quarter of a turn in the screwing direction, this rotation bringing into play over-riding of a hard point.

Abstract: The invention concerns metal cages for set screw--cage systems intended to be mounted on a metal sheet accessible from only one of its faces. According to one aspect of the invention, the sidewalls 4 of the cage 3 of such a system are provided with an annular rib 16 projecting radially outwards, the external diameter of cage 3 at the rib 16 being slightly greater than the diameter of the hole 12 in which the cage is engaged, owing to which the cage is axially locked on the metal sheet. Dies are provided for the shaping of cage members. The invention finds application particularly in the fitting out of the bodies of vehicles.

Abstract: To fasten by screwing an object on to a metal plate 9 drilled with a noncircular hole 12, recourse is had to a clip made from a moulded plastic material comprising a socket 1 adapted to receive a screw and extended by a flange 5. In the wall of the socket there are provided two grooves 10 in the form of a U each surrounding a thickened portion 7, said portion being connected to the inner edge of the flange by a bridge 11 and nipping, during screwing of the screw into the socket, the edge of the metal plate by bending around this bridge.