| 摘要 |
<p>The element has a shaft extending along a longitudinal axis. A profiling device (26) e.g. stamped flexural part, is provided with radially protruding profiling sections (27) i.e. thread sections, where maximum radial extension (R) of the profiling device in a region of the profiling section corresponds to 1.02 to 1.2 times of nominal diameter of a borehole. The profiling sections are radially displaced relative to each other. A mixing device (22) and the profiling device are provided at a separate element (21), which has a coupling section (30) for coupling with the fastening element.</p> |
