Abstract: The invention relates to a screw (IO) in order to cut a mating thread in a plastic article, comprising a lower threaded part (F) and an upper threaded part (T), the lower threaded part having a larger diameter and its tip covering a larger surface than the upper threaded part.

Abstract: A self-tapping screw (10, 30) comprising a drive (12) and a shank (14) bearing a thread comprising a main thread (16, 32), wherein the main thread (16, 32) has a maximum main thread external diameter (DAF) and a cutting area (F) and a supporting area (T) following in the direction of the drive (12), wherein the shank (14) has a threaded end (18) at an end opposite the drive (12), with the screw end (18) having a diameter (DE) of at least 20% of the maximum main thread external diameter (DAF), The shank further has, in the region of the screw end (18), a tap flute (20), wherein the tap flute (20) comprises at least two tapping thread turns (20a, 20b, 20c) which attain, in their external diameter (DAA), no more than 90% of the maximum main thread external diameter (DAF) and form a tap region in which the tapping thread turns (20a, 20b, 20c) have the same diameter development, and in addition in that the diameter of the main thread (16, 32) in the tap flute region (AB) is less than or equal to the diameter (DAA)

Abstract: The invention relates to a screw (IO) in order to cut a mating thread in a plastic article, comprising a lower threaded part (F) and an upper threaded part (T), the lower threaded part having a larger diameter and its tip covering a larger surface than the upper threaded part.

Abstract: A self-tapping screw (10, 30) comprising a drive (12) and a shank (14) bearing a thread comprising a main thread (16, 32), wherein the main thread (16, 32) has a maximum main thread external diameter (DAF) and a cutting area (F) and a supporting area (T) following in the direction of the drive (12), wherein the shank (14) has a threaded end (18) at an end opposite the drive (12), with the screw end (18) having a diameter (DE) of at least 20% of the maximum main thread external diameter (DAF), The shank further has, in the region of the screw end (18), a tap flute (20), wherein the tap flute (20) comprises at least two tapping thread turns (20a, 20b, 20c) which attain, in their external diameter (DAA), no more than 90% of the maximum main thread external diameter (DAF) and form a tap region in which the tapping thread turns (20a, 20b, 20c) have the same diameter development, and in addition in that the diameter of the main thread (16, 32) in the tap flute region (AB) is less than or equal to the diameter (DAA)

Abstract: The invention relates to a rotationally symmetrical fastening element with an axially centralized rounded tip for a friction-welded joint with a flat component. The tip is adjoined by a conical lateral surface, the conical lateral surface transitioning into a flute for receiving a material melted during friction-welding, and by a shoulder, wherein the shoulder surrounds the flute, is axially recessed in relation to the tip and transitions into the friction-welded joint.

Abstract: The invention relates to a rotationally symmetrical fastening element with an axially centralized rounded tip for a friction-welded joint with a flat component. The tip is adjoined by a conical lateral surface, said conical lateral surface transitioning into a flute for receiving material melted during friction-welding, and by a shoulder, wherein said shoulder surrounds the flute, is axially recessed in relation to the tip and transitions into the friction-welded joint.

Abstract: The invention relates to a self-tapping screw, whose threads, in a rear area (facing the head), have a substantially cylindrical external diameter and, in a front area (facing away from the head), extend with an external diameter which decreases towards the end of the screw. Both in the rear area and in the front area, the threads have an asymmetrical cross section with a bisector of the flank angle, measured at the thread tips, which is located obliquly with respect to the axial course of the core and which reverses from the rear area (first cross section) towards the front area (second cross section), the bisector in the front area being inclined towards the screw head. The reversal point of the thread cross section is placed such that the first cross section is substantially present in the rear area, the second cross section substantially in the front area.

Abstract: The invention relates to a device for securing a structural element provided with a hole to a panel-like component, said panel-like component being fitted with a stay-bolt onto which can be pressed on the side opposite the component a hollow cylindrical part with a flange, said hollow cylindrical part being able to be received by the hole and having a latching portion, the flange having a diameter greater than the diameter of the hole. A metal part, forming the latching portion and having a plurality of latching lugs, is inserted into the hollow cylindrical part, wherein the hollow cylindrical part has a spring portion which yields to axial pressure and the structural element is provided on its side facing the component with an inwardly directed collar on which rests the hollow cylindrical part with its end opposite the flange when the hollow cylindrical part is in the secured position with the spring portion pressed in.

Abstract: The invention relates to a self-tapping screw, whose threads, in a rear area (facing the head), have a substantially cylindrical external diameter and, in a front area (facing away from the head), extend with an external diameter which decreases towards the end of the screw. Both in the rear area and in the front area, the threads have an asymmetrical cross section with a bisector of the flank angle, measured at the thread tips, which is located obliquly with respect to the axial course of the core and which reverses from the rear area (first cross section) towards the front area (second cross section), the bisector in the front area being inclined towards the screw head. The reversal point of the thread cross section is placed such that the first cross section is substantially present in the rear area, the second cross section substantially in the front area.

Abstract: Self-tapping screw with rolled thread turns, on which the angle bisector of the thread turn formed by the load flank and the rear flank slopes away from the screw head at an angle to the perpendicular to the screw axis, the load flank running in a straight line to the thread root, and the rear flank initially extending in a straight line from the thread tip and, at about ⅓ of its height, merging via a kink into a straight angled portion at an angle that is greater than the angle, measured relative to the perpendicular, of the rear flank and is between 30° and 50°, the ratio of the thread's core diameter to the thread's outside diameter being greater than 0.7 and the ratio of the thread pitch to the thread's outside diameter being less than 0.25.

Abstract: Self-tapping screw with rolled thread turns, on which the angle bisector of the thread turn formed by the load flank and the rear flank slopes away from the screw head at an angle to the perpendicular to the screw axis, the load flank running in a straight line to the thread root, and the rear flank initially extending in a straight line from the thread tip and, at about ⅓ of its height, merging via a kink into a straight angled portion at an angle that is greater than the angle, measured relative to the perpendicular, of the rear flank and is between 30° and 50°, the ratio of the thread's core diameter to the thread's outside diameter being greater than 0.7 and the ratio of the thread pitch to the thread's outside diameter being less than 0.25.

Abstract: A self-drilling and thread-forming screw comprises a threaded shank, a drilling section arranged in front of the shank and having a uniform diameter, and a thread-free flow-forming section widening conically between the drilling section and the shank. The drilling section has two chip grooves which run diametrically opposite one another, are bounded by flute edges and cutting edges, and end in a drilling tip with the cutting edges running together at the tip. The diameter formed by the cutting edges is smaller than a minor diameter of the threaded shank, and the largest diameter of the flow-forming section corresponds to the minor diameter of the shank and includes a symmetrical polygonal cross-section with rounded-off corners in a region adjoining the shank.