| 摘要 |
<p>The screw has a threaded shaft provided with a thread (20) and formed at a screw head, where thread depth is not constantly implemented in a thread segment during rotation around a longitudinal axis. An edge of cross sectional surfaces of the threaded shaft and/or the thread is formed as ellipse. The edge of the cross sectional surfaces of the thread is not formed as a closed path during complete rotation around the longitudinal axis. The thread thickness is not constantly implemented in a threaded area during rotation around the longitudinal axis.</p> |
