Abstract: A self-tapping screw made of synthetic material has a threaded shank defining a screw center line. The screw has proximal and distal insertion ends, the shank including first and second portions, the second proximal to the first. The pitch is the same in the first and second portions, and has a complete thread cross-section in the second portion. In the first portion, in the direction of the thread, the thread is divided into segments having an incomplete thread cross-section, the thread segments having leading end and trailing ends. The leading end of one thread segment extends further radially than the leading end of the thread segment preceding it and forms a cutting edge. In most of the thread segments the thread top in question, for substantially its full length, starting with the leading end, considered in thread direction, is situated at a constant radial distance from the center line.

Abstract: A fastening device of locking press button type includes a first element (1) which in use is present at a substrate and a second element (9) which, to fasten an object (10) to the substrate, can be releasably fastened to the first element by way of a to a snapping part (2) of the first element snapping snapping part (11) of it and wherein the elements (1, 9) remote from their snapping part (2, 11 respectively) have a hooking part (3, 8 respectively) such that the elements (1, 9) first have to be mutually engaged making a mutual angle by the hooking parts (3, 8) and then are pivoted onto each other to subsequently be fixed snapped to each other.

Abstract: A fastening device of locking press button type includes a first element (1) which in use is present at a substrate and a second element (9) which, to fasten an object (10) to the substrate, can be releasably fastened to the first element by way of a to a snapping part (2) of the first element snapping snapping part (11) of it and wherein the elements (1, 9) remote from their snapping part (2, 11 respectively) have a hooking part (3, 8 respectively) such that the elements (1, 9) first have to be mutually engaged making a mutual angle by the hooking parts (3, 8) and then are pivoted onto each other to subsequently be fixed snapped to each other.