| 摘要 |
The plastic inlay or onlay (5) matches the groove of the screw and adapts the thread pitch. The plastic inlay/onlay following the screw is fixed to the screw unit (1) in the transition part between the shank (3) and thread (4). Near the screw point (1a) the plastic interponate is in contact with the wall of the bored hole by means of its free end (7).
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