| 摘要 |
The present invention relates to a concrete screw (1) comprising; a head portion (3) comprising a head member (5) adapted to fit to a mounting tool, a first shaft (7), substantially uniformly rod shaped having an essentially uniform first diameter (d1), a second shaft (9), substantially uniformly rod shaped having an essentially uniform second diameter (d2). The concrete screw (1) further comprises a front section (11) comprising an outer surface (13) and a front end (15), and threads (17) having an essentially uniform third outer diameter (d3), wherein the threads (17) are arranged on the second shaft (9) and the front section (11). The first shaft (7) comprises at least one deformation indicator (19), arranged on the periphery of the first shaft (7). |
