Product selection guide 4. The right corrosion protection class It is important to know what requirements there are for the fastening’s corrosion resistance. Our range contains fastenings intended for corrosion protection classes C1-C5. These correspond to environments from clean indoor environments to outdoor environments with aggressive at- mospheric pollutants or salty air. Bear in mind that stainless steel fastenings certainly cost more to buy, but are frequently more economic over time. Choosing stainless steel is usually a cheap insurance policy. Pages 100-101. 5. The right drill capacity and dimensions When you use a self-drilling screw, it is important that you know the thickness of the steel to which you want to fasten. A self-drilling screw is always intended for a specific range of sub- strate thicknesses. Bear in mind that the point can never drill deeper than its own length. The dimensions should be selected based on the loading and other conditions. 6. The right clamp length KL Take care to ensure the screw’s clamp length (CL) is sufficient. The clamp length is always reck- oned from the outer surface to the inside of the substrate to which you are fastening. In other words, you must always count both the outer surface and the substrate in the clamp length. 7. The right colour If the fastening is to be in a colour that matches the steel sheeting, it is important to choose the colour with care. Check the colour against the steel sheeting manufacturer’s designation and colour samples. The wrong colour can cause unnecessary waiting times and higher costs. Read more about Unite’s experience in painted construction screws on pages 98-99. 8. The right power screwdriver and speed The recommended speed for self-drilling screws can be found under the installation instruc- tion on page 102. It is also on the packaging, so it is always available to the fitters. When you use self-drilling screws, it is important that you choose the right speed. 9. The right sockets and bits Replace worn sockets, because they can damage the screw’s paint and surface treatment. Magnetic sockets should not be used with painted construction screws or our Marutex products. They attract metal shavings that then stick and rust in the paint on the screws. 10. Avoid leaks Never over-tighten screws with sealing washers so the rubber “flows out”. The materi- al in our sealing washers is very high quality, but it can deform if tightened too hard. 16 Marutex presentation pages 7-11 C F Paint systems pages 98-99
Download PDF file