Fastening device (1) for fastening a
toilet seat component (2) to a
toilet bowl (3) with prepared recesses (4, 5) for fastening the
toilet seat component (2), wherein the fastening device (1) comprises a screw (6) with a
screw head (7) and with a
screw thread (8), a
dowel (9) with a neck portion (11), and a sleeve (17) received via the
screw thread (8), wherein the screw (6) passes through the
dowel (9) and the sleeve (17) so that, upon an externally induced rotational movement of the screw (6) relative to the sleeve (17), the sleeve (17) can be displaced in the axial direction along the screw (6), wherein the sleeve (17) has an expanded portion (19), wherein the expanded portion (19) and a plurality of movably designed
dowel arms (13-16) of the dowel (9) can be brought into mutual contact,so that, depending on the extent of displacement of the sleeve (17) in the direction of the
screw head (7) by the rotational movement of the screw (6) in a first direction of rotation of the screw (6), the dowel arms (13-16) can be adjusted outwards to different extents from an initial position of the fastening device (1) applied to the dowel (9), and the dowel arms (13-16) can be adjusted inwards by a displacement of the sleeve (17) in the direction away from the
screw head (7) by a rotational movement of the screw (6) in a second direction of rotation of the screw (6), characterized in that the sleeve (17) has stop means (28) matched to a dowel arm (13-16), which, when the screw (6) rotates relative to the dowel (9), prevents or limits a joint rotational movement of the screw (6) and the sleeve (17) due to the sleeve (17) being carried along by the screw (6), in that the stop means (28) come into contact with a dowel arm (13-16), , wherein the elongated, slender dowel has a widened or enlarged flat head at the top, which is, for example,
flange-like, to the remaining part of the dowel adjoining it on one side or downwards with a neck section and dowel arms, wherein the sleeve comprises an outer sleeve base body made of plastic, with the expansion section on the outside, with an internal thread matching the external thread of the screw, wherein the dowel has a head section and the dowel arms are present on the side of the neck section facing away from the head section, wherein a collar of the dowel is formed between the neck section and the dowel arms, which collar has an external dimension that is larger than an external dimension of the neck section, so that the dowel is designed such that the fastening device can be secured against being pulled out upwards in the longitudinal direction when inserted into the toilet seat component.