The raising stock of hardwood and the increasing popularity to build with timber are strong drivers to use hardwood as structural material on a regular basis. Despite its outstanding mechanical properties, economic boundary conditions in producing structural hardwood products consequence, however, rather a niche application. Efficient fastener and joint solutions which are optimised for hardwood are one possible solution to increase the share of hardwood in structural applications. Within this contribution a new, innovative and for hardwood optimised screw is benchmarked with a commercial screw. The influence of wood anatomy, thread-grain angle and predrilling on the withdrawal strength of single screws are analysed. For groups of screws, the minimum edge-distance and spacing perpendicular to the grain are determined and various possibilities for end-grain joints investigated. A generic approach for predicting the withdrawal strength of axially loaded self-tapping screws inserted in structural timber or glued laminated timber products from either soft- or hardwood is presented. Models to account for the influence of density, thread-grain angle and predrilling are proposed and regulations for the geometric requirements and execution of groups of screws in end-grain joints discussed.

硬木库存的增加和用木材建造的日益普及是定期使用硬木作为结构材料的强大动力。尽管具有出色的机械性能，但是在生产结构性硬木产品中的经济边界条件仍然是一种利基应用。针对硬木进行了优化的高效紧固件和接头解决方案是增加硬木在结构应用中所占份额的一种可行解决方案。在此贡献中，一种新型，创新且针对硬木优化的螺钉以商业螺钉为基准。分析了木材的解剖结构，牙纹角度和预钻孔对单颗螺钉的拔出强度的影响。对于螺丝组，确定垂直于晶粒的最小边缘距离和间距，并研究端粒接缝的各种可能性。提出了一种通用方法，用于预测从软木或硬木中插入结构木材或胶合层压木材产品中的轴向加载的自攻螺钉的退出强度。提出了考虑密度，螺纹晶粒角度和预钻孔影响的模型，并讨论了在端面晶粒接头中几何要求和螺钉组的执行规则。