| 摘要 |
PCT No. PCT/EP98/02475 Sec. 371 Date Nov. 1, 1999 Sec. 102(e) Date Nov. 1, 1999 PCT Filed Apr. 25, 1998 PCT Pub. No. WO98/50706 PCT Pub. Date Nov. 12, 1998A screw comprises a shank (2) and a head provided with a tool drive (6). The shank is provided with a thread (4), and at its free end has a boring part (5). The head (3), measured in axial direction of the screw (1), has a height (LK), which is smaller than the pitch (S) of the thread (4) formed on the shank (2). An external tool drive (6) is formed on the head (3).
|
