9 and the inner wall of the pass through opening in the narrowed region of the tubular extension screw 9 has a thread over at least a major portion of the length of its shaft in order to achieve greater displacement opportunity between the screw and the tubular extension 8 this thread preferably extends over the entire length of shaft 11 in the illustrated embodiment of the fastening element there are provided on shaft 11 of screw 9 two differently configured thread sections 13 and 14 these two thread sections 13 and 14 preferably have different diameters but the same thread pitch this precludes relative motion between screw 9 and tubular extension 8 during the initial setting of the screw 9 i e during turning of screw 9 into the substructure 6 the tubular extension 8 and with it also the large area washer 7 remain in their initial positions until the final setting of screw 9 however thereafter additional drawing and pressing together of washer 7 is possible by rotating it together with its tubular extension a match to the materials into which they are to be driven can be achieved by special configuration of the thread segments thus in the proposed example the thread section 14 with the smaller diameter at the free end of shaft 11 should take the form of a double thread in which the two thread sections have different outer diameters in the proposed embodiment the two thread sections 13 and 14 with different diameters are so conformed to the pass through opening in the narrowed region 12 of the tubular extension 8 that the outer diameter of the section of shaft 11 having the smaller diameter thread is approximately equal to the cross section.