Screw has head with upper surface, lower surface and side edge, which run between upper surface and lower surface, and shank is connected with head

摘要

Screw (2) exhibits a head with an upper surface, lower surface and a side edge, which run between the upper surface and the lower surface, and a shank is connected with the head. It exhibits a distal end, a first section (222), which is connected with the distal end and is trained into first threads with respective thread crest (2234). A second section (223) is connected to the lower surface of the head and is trained on second threads with respective thread crest, whereby the threads run in the same direction spirally as the threads of the first section. The number of threads per unit length in the second section exceeds the number of threads per unit length in the first section, A third section (224) is arranged between the first section and the second section which exhibits a thread-equivalent structure which mainly serves to splinters and fasten the screw.