Fastening screw for use with nut, has threads, and head sided flank with angle smaller than shaft flank angle lying in specific range, where ratio of inclination of threads to nominal diameter of screw shaft lies between specific values

摘要

The screw has a screw head with a drive device, and two threads. The threads have a head sided flank (8) turned to the screw head and a shaft sided flank turned away from the screw head. The head sided flank and the shaft sided flank comprise respective head sided flank angle and the shaft sided flank angle orthogonal to a screw axis. The head sided flank angle is smaller than the shaft sided flank angle, which lies in a range of about 55 degree+- ten degree, where inclination ratio of inclination of threads to a nominal diameter of a screw shaft lies between specific values. An independent claim is also included for a counterpart, in particular a lug and screw nut, for screw connection with a fastening screw.