| 摘要 |
<p>The invention concerns a wood-screw characterised in that it comprises two identical threads (5) and (6) longitudinally offset. Each of them consisting of two unsymmetrical flanks, one in front (9) along a first slope and the other at the rear (10) along a steeper slope. The threads start the furthest possible towards the front of the tip (4).</p> |
