Abstract: The joining element comprising a fastener or screw shank having a head has adjacent to said head a portion with a plurality of parallel, concentric fit-stretch rings, whose external diameter is 0.1 to 0.5 mm larger than the external diameter of the fastening thread. A fit slot is formed between in each case two rings, with a notch groove radius which is two to three times the top radius of the fastening thread. In the transition region between the head and the aforementioned portion is provided a fillet with a rounded portion having a diameter corresponding roughly to the pitch diameter of the rings and with a radius of curvature amounting to approximately to 0.1 to 0.15 times the external diameter. The rings have a stressing cross-section in the notch groove corresponding to the stressing cross-section of the fastening thread. The top width of the rings approximately corresponds to the side width of the preliminary shape of the rings.

Abstract: Articulated joint comprising a cylindrical hollow drive element (2) and a spherical drive element (5) at the end of in each case one shaft (1,2), in which the hollow drive element (2) is roughly shaped like a hollow cylinder with a wavy inner profiling and the spherical drive element (5) has a spherical shape with a wavy profiling complimentary thereto, in such a way that even on pivoting the shafts with respect to one another there is a positive connection and reliable force transfer during rotation (FIG. 1).

Abstract: The screw is provided with a three-lobed thread crest, followed by a threaded portion with a three-lobed thread geometry, which passes into a threaded portion with a circular thread geometry. In all three threaded portions the flank angle of the thread is 60.degree. and the flank angle of the thread crests extending beyond the nominal diameter of the screw is 30.degree..

Abstract: Method and dies for threading a screw comprises providing a screw blank with a portion of its length of lobular cross section and an adjacent portion of the blank of circular cross section. The blank is rolled between roll dies so as to roll the thread on the circular portion and simultaneously roll the thread at the lobes only on the lobular portion. Thereafter, the blank is rolled to additional regions of the dies wherein the thread is rolled to form on the lobular section, while the cylindrical section passes through regions of clearance or relief on the dies.