Abstract: A fastening element for attaching plate-shaped boards, and including a large-surface clamping member (2;22) with a hollow-stem (3;23) projecting from opening in the clamping member (2,22) with a hollow stem (3;23) projecting from and having a bore (5;25) opening in the clamping member (2;22) for receiving an expansion member (14) for an anchoring member (4;14); and a plug-shaped member (9;29) attached to the clamping member (2;22) with a strap (8;28) for closing the bore and having a plug-in section (11) with a sealing surface (12;32) sealing by cooperating with the bore wall and is force-lockingly retained therein, with the plug-in section (11;31) having at least one recess (13;33) provided with an undercut and a largest diameter of which corresponds to a diameter of a stem (15) of the expansion member (14) for enabling the closing member (9;29) to eclipse the shaft (15) of the expansion member (14).

Abstract: An expansion dowel is formed of an axially elongated expansion member and an expansion element insertable into a bore through the expansion member. The expansion member has two axially extending first slots located diametrically opposite one another and open at one end of the member. Two axially extending second slots are located in the expansion member offset circumferentially by 90.degree. from the first slots. The second slots are closed at their opposite ends. The first and second slots partially overlap in the axial direction, so that the expansion member is radially expandable in the overlapping region of the slots, while the expansion element is prevented from moving off center during the expanding operation.