| 摘要 |
<p>The screw has a screw head, a drill bit (3), and a screw shaft (7) connecting the head with the bit. A thread (5) is provided below the bit, and extends to a part of the shaft. The shaft is smoothly formed between the thread and the screw head. The shaft comprises a radially distant breaking off wing (8). The shaft directly comprises a section with another thread that has a larger gradient than the former thread and is formed as a pitch thread.</p> |
