| 摘要 |
<p>The fixing element (10) has a shaft (11) with a tip (13) and a head (14). The thread profile (15) in the sector (22) nearest the tip has a constant steep rise at an angle of 50 to 74[deg]. The other sector (21) continues the rise towards the tip, and a half the length between the tip and the opposite end of this sector, has a rise angle of at least 75[deg].</p> |
