| 摘要 |
<p>The invention relates to a thread-cutting screw for screwing into a pre-bored hole in concrete, brickwork or similar. The inventive screw is characterised in that the bearing screw thread surface A0n of the stressed screw thread flank that is scaled to the bearing screw-thread length he and that cuts into the hole wall of the pre-bored hole behaves as in formula (I) in relation to the nominal bore diameter (db), k being a constant of the value 1 < k <=2,5.</p> |
