Beam anchorages, timber facades and other wood structures - thick fixtures often need to be anchored to concrete in roof and timber construction. fischer now offers 29 new versions of the Ultracut FBS II in zinc-plated carbon steel as well as stainless steel with longer usable lengths for these applications. The European Technical Assessment (ETA) provides users with added security. Depending on the variant, the screw lengths for wood construction reach up to 190 mm at a diameter of 8 mm, up to 280 mm at a diameter of 10 mm, up to 210 mm at a diameter of 12 mm and up to 240 mm at a diameter of 14 mm. This offers the advantage of maximum flexibility and a versatile range of applications. The Ultracut FBS II can be unscrewed, stabilised and readjusted up to two times in compliance with regulations and can also easily be disassembled. The ribs under the head prevent the concrete screw from unintentionally loosening. 

Wood construction specialists and carpenters can now adjust beams and sleepers even more easily with the new FSW adjusting washer combined with the Ultracut FBS II hexagon head US in a 10 mm diameter (zinc-plated). Roof trusses and prefab houses must always be put up on an even surface, which involves horizontally aligning the eaves purlin or spirit levels on what tends to be uneven surfaces. If this preliminary work isn’t carried out with care, serious building defects are inevitable and roof trusses or entire homes will be crooked. Until recently, carpenters often had to lift beams between two people and adjust wood blocks of different sizes underneath. This method is highly laborious, however. 

fischer’s FSW provides the solution, as the adjusting washer can be fastened to concrete in no time together with the zinc-plated Ultracut FBS II 10 US. Next, a second FSW with a downward-facing notch is placed over the head of the FBS II and fastened to the wood beam with at least two Power-Fast FPF-PT 5.0x40 ZPF screws to allow precise adjustment. To do so, the wooden beam is precisely aligned with an impact wrench, such as fischer’s FSS 18V 400BL with torque control, by slightly loosening the FBS and subsequently lining it with mortar. The upper FSW can be disassembled as required. This adjustment process is so simple that it can be carried out by just one person.

Wood parts can easily and safely be fastened to concrete with the fischer Ultracut FBS II. Simply insert the concrete screw into the drill hole using the push-through method of installation, and finished. No further drill hole cleaning is required during vertical drilling in floors and ceilings or when using hollow drills with vacuum functions. The FBS II can be used to erect timber-frame constructions, fasten support beams, frame elements and roof purlins or anchor sleepers and beams in practically one single insertion process. Up to three different, approved screw-in depths can be used to match the existing load for each FBS II variant. The concrete screw’s patented thread geometry and large core diameter support high shear and tensile loads in concrete, which allows many applications to be carried out with fewer fastening points. The FBS II’s screw flanks cut deep into the concrete as it is inserted. This optimum fit ensures reliable pressure transfer, anchorages free of expansion pressure as well as low edge and axial spacing for simple and safe installation. 

Further advantages include the fact that the FBS II can be reused under certain circumstances, for instance to temporarily anchor inclined formwork supports in fresh concrete that hasn’t fully set yet. The measuring sleeve should be used to test the wear of the thread and ensure it still works sufficiently. fischer’s concrete screws cover a wide range of applications with various diameters of 6 to 14 mm in its zinc-plated versions and 8 to 12 mm in stainless steel (R) variants and their many different head types. Their European Technical Assessment (ETA) for applications in concrete covers fire resistance class R 120 and in most cases seismic applications in performance categories C1 and C2. Overall, fischer always offers the right ULTRACUT FBS II for most fixing tasks with its head types, indoor and outdoor versions, multiple fixings and many more.