Screw for fastening window frames to walls has collar below its head, gap between two corresponding to thickness of outer profile wall and cylindrical section between collar and thread fitting through bores in inner profile walls

摘要

The screw for fastening metal profile reinforced plastic window frames to walls has a collar below its head (6). The width of the gap between the two corresponds to the thickness of the outer profile wall (10). The section of the screw between the collar and thread is cylindrical and fits through bores (20, 21) in inner profile walls (22, 23).