Eurotec catalogue wood construction screws Sida 15
Kommersiell Kunderbjudande **Toppförsäljare från Eurotec
Wood construction screws OTHER ADVANTAGES OF OUR WOOD CONSTRUCTION SCREWS SEISMIC PERFORMANCE EUROTEC PANELTWISTEC 8.0 MM AND TOPDUO IN THE HIGHEST “EARTHQUAKE CLASS”, S3 Fasteners may be assigned to “low-cycle ductility classes” for application in earthquake-prone areas. The classes are designated as S1, S2 or S3 in ascending order of “seismic performance”. To achieve this, the screws are bent at a specific angle alternately in up to 3 cycles. With each cycle, checks are performed to determine whether at least 80% of the mean flow torquea) of an unbent screw of the same type is still being achieved. If this is the case, the screws may be classified according to the respective ductility class. Despite their high strength these screws are ductile, meaning they are flexible enough to be bent backwards and forwards multiple times without failing due to becoming brittle. In the event of an earthquake, this increases the likelihood that, for example, a timber-timber connection would yield “softly” rather than failing suddenly. This may be the decisive factor when it comes to potential damage to life, limb and property. The flow torque describes the resistance of the screw to bending; in other words, the “bending stiffness”. a) For more information and exact test logs see our seismic performance brochure at www.eurotec.team/catalogue IMPACT WRENCH Can screws be inserted using an impact wrench? The method of screwing in (continuous rotary drilling or tangential impact) wood construction screws is regulated neither under EN 14592 nor under European Technical Approvals (ETA). However, inserting long screws by rotary drilling is laborious for the user, leading to the question as to the admissibility of using an impact wrench with tangential impact. To clarify this question, Eurotec hardened carbon steel wood construction screws with a nominal diameter of 8.0 mm were subjected to comparative tests. The screws were inserted using both rotary drilling and with tangential impact. Pull-out resistance and tensile strength were then tested. The outcome was that the screw-in method had no significant impact on the load-bearing capacity of the screw itself or the pull-out resistance. With this in mind, an impact wrench may also be used for driving Eurotec wood construction screws with partial or full threads made from hardened carbon steel into solid timber, glued laminated timber, laminated beams or veneer laminated timber made from softwood timber. © diyanadimitrova – stock.adobe.com RELIABILITY FOR WOOD CONSTRUCTION SCREWS For more information and exact test logs see our brochure on impact wrenches and their compatibility with wood construction screws at www.eurotec.team/catalogue 15
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