Construction Fixings

Combining ease of installation with safety, when introducing high loads into concrete, the UltraCut FBS II screws from fischer are now suited to a wider set of applications, as a result of the latest technical developments to the range. 

For instance, the FBS II 6-10 versions can now also be used in masonry, in accordance with the European Technical Assessment (ETA) certification. In addition, the new FSW adjustment disk, in conjunction with the FBS II 10 US gvz, enables sleepers and beams to be adjusted and aligned quickly and easily. This whole range of concrete screws combines maximum load bearing capacity with quick installation and come in both steel and stainless steel versions, both meeting ETA standards covering their use in cracked and non-cracked concrete, indoors and outdoors, as well as with seismic loads of performance categories C1 and C2. They are also rated to fire resistance level FRL R120. 

Further advantages of using the UltraCut FBS II include its reliable power transmission and installations free of expansion pressure, due to its precise fit. Patented thread geometry and its large core diameter introduce very high tensile and shear forces into the concrete, which means fewer fastening points are needed than was previously the case. 

The UltraCut FBS II can also be re-used under certain conditions and allows small edge and centre distances, and offers power saving, safe assembly. As for loads, the concrete screw allows maximum flexibility, depending on the diameter, with up to three approved screwing or anchoring depths. Using the screw is also very simple, the user simply screws the UltraCut FBS II concrete screw into the drill hole using push-through installation, with no further drill hole cleaning required for vertical drilling in floor and ceiling areas or when using hollow drills with a suction function.

The FBS II 6-10 versions include FBS II versions with diameters 6mm – 10mm in electrogalvanised steel and with diameters 8mm – 10mm in multi-coated steel CP and stainless steel. These have been evaluated for anchoring in solid and perforated brick masonry, with brick types Mz bricks (EN 771-1), solid sand-lime brick KS (EN 771-2) and perforated sand-lime brick KSL (EN 771-2). 

The screw can also be anchored directly into the brickwork, into the joint, as a single dowel, as a dowel group, or in plastered masonry. In the specific case of adjusting and aligning beams and sleepers using the new FSW adjusting disc, in conjunction with the UltraCut FBS II 10 US gvz hexagon head concrete screw, timber workers and carpenters can now make those adjustments more quickly and easily than before. 

Until now, carpenters, usually in pairs, had to lift the beams and place wooden blocks of different thicknesses underneath them for adjustment. This method is very labour intensive. This is where the FSW adjusting disk comes in, with only a few steps required: Fasten the FSW together with the UltraCut FBS II 10 US gvz through the beam in the concrete, then put a second FSW upside down over the FBS II head, with the notch facing down. Then fasten it to the wooden beam with Power-Fast FPF-PT 5x40 screws, which enables the precise adjustment to be made. The wooden beam is screwed using an impact wrench, such as the fischer FSS 18V 400BL with torque control, aligned with millimetre precision by simply turning the FBS II back. The upper FSW can be dismantled and re-used.