ignation Des D21F D31F D32F D33F Unifast Stitching screws for roofing and cladding Construction screw for overlapping e.g. when fastening insulated, load-bearing roofing sheet. Hexagon flange head, Ø 14 mm. ensions Dim 5,5 x 20 6,3 x 22 6,3 x 22 6,3 x 32 ngth p le Clam Min Drill capacity cl. rosiotnection terial Max Cor pro Ma asher Ø W /socket Bit tity/pack cription Quan Des 2 x 0,65 2 x 1,0 C2 14 8 mm 250 2 x 0,65 2 x 1,0 C2 14 8 mm 250 2 x 1,0 2 x 1,5 C2 14 8 mm 250 2 x 1,0 2 x1,5 C2 14 8 mm 250 For joining thin roofing and cladding, stitching screws with redu- ced drill point, low thread pitch and free space between thread and head are used. During assembly, the sheets are placed together and clamped in the free space between the thread and the head. Stitching screws should always be tightened to spin. The right free space reduces the risk of incorrect assembly. If there is too little free space, there is a risk that the lower sheet will loosen when the screw spins and if it is too great, the sheets will not be tightened together properly. This can result in ske- wing, which reduces the bearing capacity with respect to hole edge failure. C Corrosion protection classes pages 98-99 T Technical facts/installation pages 100-105 25
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