| 摘要 |
<p>A screw (10) comprising a screw head (12) and a screw shank (14) provided with a first screw thread (20) having a thread root and a major diameter, said first screw thread being adapted for forming a thread, in particular into plastics, soft metals and the like, wherein the screw shank (14) is provided with a second thread (24) having a major diameter, said second thread (24) extends along at least one axial portion of said screw shank (14) in said thread root of said first thread (20), and that said major diameter of said second screw thread (24) is smaller than said major diameter of said first screw thread (20). <IMAGE></p> |
