TEPRO® K’ in K’ Threaded plastic fasteners solutions for plastic assemblies Self-forming – self-tapping – adjustable – revers

Effectiveness and functionality of thread profiles 3 ■ Bollhoff regular thread ■ Bollhoff round high thread Details about forming and tapping process 3 Manufacturing and selection of material 4 ■ Operating sphere ■ Repeatable threaded connection ■ Mounting hole ■ Insert for ultrasonic welding ■ Mechanical components ■ Body-bound rivet ■ Screw-in blind rivet ■ Screws ■ Inserts ■ Systems Examples for scopes of application 10 Technical Information The assembly of plastic components using plastic screws and thread inserts is largely dependent on the mechanical requirements of the joint and whether...

Effectiveness and functionality of thread profiles The precise thread geometry is fundamental to the effectiveness of K’ in K’ screw fastenings, as the fastener forms or taps a ‘female’ thread into cylindrical, close tolerance, pilot holes. Thread profile: Thread pitch, height of profile, pitch angle as well as the radius at the flank end and flank base, all influence the effectiveness of tapping or forming an internal thread into the parent material. The characteristics of the base material determines the type of K’ in K’ thread profile. Thread forming is determined by either patented option;...

Details about forming and tapping process A chip flute, running the length of the screw, enables effective tapping and forming without obstructing the thread flanks. The resulting cutting angle and adjacent clearance angle are at their most effective as the screw assembly is driven home under minimal torque. The Böllhoff K’ in K’ regular thread corresponds to action of a screw tap and the Böllhoff K’ in K’ round and high thread to that of a thread former. Torque and thread locking The previously described geometry generates a low assembly torque during the process of turning the screw, whilst...

Versions of TEPRO® K’ in K’ As previously featured, the development principle of plastic (K' in K') thread fastenings provides for coordinated solutions for de-mountable and permanent fixings. Here we differentiate three K' in K' options: The following criteria are integral to final development of a self-forming, self-cutting fastener: ■ Head shape and drive ■ Support and power transmission ■ Thread cutting geometry The operating sphere of K’ in K’ screw Head design Different styles are available, including ■ DIN EN ISO 7045 slotted pan head screw ■ DIN 34812 slotted pan head plastic screw ■...

The screws Repeatable threaded connection Reversible thread connection of K' in K' screws enables repeated assembly and disassembly without deterioration of the thread, thread locking or overall performance. Mounting hole The diameter of any pilot hole has to be such that the central diameter of the K’ in K’ screw is clear of any deformation of the host material. To relieve the setting load, surface countersinking appropriate for the screw size and to a depth of one thread pitch is required. The countersinking aids with the location of the K’ in K’ screw and eases the introduction of the lead-in...

Inserts For the best results, the ultrasound vibration unit should be supplied by recognised manufacturers of ultrasonic welding equipment. Currently metric threads are available in M 3, M 4, M 5, M 6 and M 8. American/British threads can be supplied. Mechanical components Plastic inserts can be screwed in by mechanical means to introduce a higher faster thread into plastic components. The external geometry of the thread is identical to the K’ in K’ screw (quod vide forming and tapping process). The precise diameter of the parallel-walled mounting hole is dependent on the material characteristics...

The advantages Screw-in blind rivet The screw-in blind rivet has been developed for fixing through round holes. To prevent rotation on setting, the surface of the rivet element has an integral flange to lip over the component edge. Other applications are made possible by an underside hexagonal form to the rivet body. The screw-in blind rivet is plugged into a hole in the bottom component. © Lateral ribs prevent the rivet from falling out prior to setting. A mating K' in K' screw is located through a hole in the top component to engage with the internal bore or the rivet and form a thread. © Different...

The advantages TEPRO® K’ in K’ systems - screw-in blind rivet ■ Fastening requires access from one side only ■ All-plastic fastening solution reduces component weight ■ Capability of recycling - no expensive separating of component parts ■ Fastening requires access from one side only ■ All-plastic fastening solution reduces component weight ■ Capability of recycling - no expensive separating of component parts ■ Thin-walled blow moulding parts Self-tapping K' in K' screws have been used effectively to fasten a two-part assembly within the interior trim of the Touareg. Here the K' in K' plastic...

Bollhoff K' in K' screw fastening solutions have been applied in different spheres. Fastening of instrument panel, threaded connection assembly carrier, fastening of headlights... ■ Commercial vehicles (lorries, tractors...): Tank for water equalizing ■ Electricity, electronics: safety switch cabinets ■ Office furniture: Chairs, desks ■ Landscape technology, lawn chairs: Shield fasteners As a specialist service provider, we welcome enquiries for K' in K' threaded fasteners and recommend solutions dependent on the parent material. The conditions for the most effective threaded fastenings in plastic...

Technical information - dimensionsTEPRO® K’ in K’ - screw-set fastening elements K' in K' bottom part K' in K' bottom part screw-in blind rivet spread nut * On request. Please contact our specialist department. Rotational speed of screw insertion 350 min-1 These indicative values have to be related to each specific application.