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The SPAX Gerber Connectors and Knaggen
What are the challenges for fastening?
The basic prerequisite for a good tanner impact is the transmission of shear force between the two purlins. To ensure this, the connector should be very large in order to be able to use as many nail or screw holes as possible. Since shearing off the fasteners is also the biggest challenge here, they should have a corresponding load-bearing capacity.
In the case of the knagge, it is above all the forces caused by tilting that are exerted by the mostly large-dimensional coupling purlins. Knaggen are therefore often designed as an isosceles triangle to absorb these forces.
What solutions does SPAX offer?
Our tanner connector SXGER is two-piece, so you always have the right connector for every wood width. There are five heights to choose from for different wood cross-sections. Furthermore, it offers a sufficiently large number of holes (2 x 23 to 2 x 35 pieces) to safely transmit the lateral forces. The small folding on the underside facilitates installation. Due to the large shear forces that occur, only our SPAX grooved nails and SPAX wood connector screws can be considered as fasteners.
A particularly solid wooden connector is our Knagge SXKN. The triangular shape in several axes is suitable for absorbing even high tilting torques and dissipating them into the wood below. We also offer five different sizes and widths for the various applications.