Eurotec Catalog Tangential Impact Page 2
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Impact wrenches approval IMPACT WRENCHES - PERMISSIBILITY FOR WOOD SCREWS Is the installation of screws by means of impact wrenches permissible? The intallation method (continuous rotation or tangential impact) of wood screws is not regulated either by EN 14592 or by the European Technical Assessments (ETA). Impact wrenches are especially useful for installing very long screws, so the question of its admissibility arises. To clarify this question, Eurotec wood screws made of carbon steel with a nominal diameter of 8,0 mm were subject of comparative tests. The screws were all installed with rotary drilling and tangential impact. Subsequently, pull-out resistance and tensile strength tests were made. This was done in each case with the longest partially and fully threaded screws in the most unfavorable material (softwood laminated veneer lumber). It was proven that the installation method has no significant effect on the load-bearing capacity of the screw itself or on its pull-out resistance. © Christian Delbert – stock.adobe.com Therefore, it is also possible to use an impact screwdriver (tangential impact) for driving Eurotec wood construction screws made of carbon steel with partial or full thread and a nominal diameter of 8.0 mm into solid wood, glulam, laminated wood beams or laminated softwood veneers. 2
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