The systems for the invisible fastening of façade panels (e.g. natural stone slabs) include the so-called undercut technique.
Image: Curtain wall ventilated façade - KEIL Befestigungstechnik
Using the patented drilling system, a hole is drilled at the back of the façade panel, which is widened in the bottom of the borehole and does not pierce the plate. The KEIL undercut anchor is inserted into the hole, which guarantees a form-fitting fastening without expansion pressure. If the panel is equipped with façade anchors, it can simply be hung into the substructure.
Image: How undercut works - WEDGE fastening technology
The undercut works - explained step by step:
In a single operation with just one tool, cylindrical drilling is carried out and then conically undercut. Depending on the machine type and material, different levels of automation are possible. The drilling time in ceramic is less than 10 seconds. Even panels of any size and weight are given a patented undercut with a precise and consistently symmetrical shape. For a cylindrical bore with a diameter of 7 mm, the undercut diameter is 9 mm. For installation, an undercut anchor is inserted into the drill hole and set in a form-fitting manner by means of a screw. Fast, easy and safe with common tools, e.g. cordless screwdrivers.
Image: How undercut works - KEIL fastening technology
The KEIL undercut anchor for the concealed fastening of thin-walled panels is made of stainless steel. Its geometry, which is adapted to the KEIL undercut drill hole, ensures expansion pressure-free fastening in all common panel materials from a panel thickness of 6 mm. Depending on the panel thickness or the required load-bearing capacity, different setting depths (hS) are available. The KEIL undercut anchor is designed in such a way that it holds more than the panel material. The KEIL undercut anchor offers significant advantages due to its high level of assembly safety. The distance-controlled setting of the anchor is quick, easy and safe for all plate thicknesses as an optimal installation with the coordinated KEIL system: anchor, plate holder and KEIL locking tooth screw with integrated screw lock. Only two parts (anchor sleeve and screw) are required for secure fastening. Other screw-in parts for the KEIL undercut anchor enable your individual connection variant, such as:
Image: How undercut works - KEIL fastening technology
Source : KEIL Fastening technology
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