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

Contents Page Introduction Effectiveness and functionality of thread profiles n Böllhoff regular thread n Böllhoff round high thread Details about forming and tapping process Manufacturing and selection of material The screws n Operating sphere n Repeatable threaded connection Inserts n Insert for ultrasonic welding The systems n Body-bound rivet n Screw-in blind rivet Examples for scopes of application Technical Information Introduction The assembly of plastic components using plastic screws and thread inserts is largely dependent on the mechanical requirements of the joint and whether a...

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...

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,...

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: n Screws n Inserts and n Systems. The screws The following criteria are integral to final development of a self-forming, self-cutting fastener: n n n n Head shape and drive Support and power transmission Thread cutting geometry Thread chamfer The operating sphere of K’ in K’ screw Head design Different styles are available, including n DIN EN ISO 7045 n...

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...

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...

The systems 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. Function 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...

The advantages TEPRO® K’ in K’ systems – screw-in blind rivet n n n n Fastening requires access from one side only No corrosion Electromagnetic compatibility All-plastic fastening solution reduces component weight n Capability of recycling – no expensive separating of component parts n Any colour TEPRO® K’ in K’ systems – body-bound rivet n n n n Fastening requires access from one side only No corrosion Electromagnetic compatibility All-plastic fastening solution reduces component weight n Capability of recycling – no expensive separating of component parts n Thin-walled blow moulding parts...

Examples for scopes of application Böllhoff K’ in K’ screw fastening solutions have been applied in different spheres. n Automotive industry: Fastening of instrument panel, threaded connection assembly carrier, fastening of headlights... n Commercial vehicles (lorries, tractors...): Tank for water equalizing n Electricity, electronics: safety switch cabinets n Office furniture: Chairs, desks n Landscape technology, lawn chairs: Shield fasteners Our Service As a specialist service provider, we welcome enquiries for K’ in K’ threaded fasteners and recommend solutions dependent on the parent...

Technical information – dimensions TEPRO® K’ in K’ – screw-set fastening elements K’ in K’ bottom part screw-in blind rivet K’ in K’ bottom part spread nut Description K’ in K’ bottom part blind rivet for K’ in K’ screw 0403 730 6418 K’ in K’ bottom part spread nut for K’ in K’ screw 0402 790 7001... Screw size/L * On request. Please contact our specialist department. Technical information – mechanical properties TEPRO® K’ in K’ systems – screw-in blind rivet Material of carrier steel Screw-in torque Tightening torque Loosening torque ME [Nm] MA [Nm] ML [Nm] 0.3 Axial pull-out force F [N]...