| 摘要 |
<p>A bolt (10) has a threaded portion (11) at its free end, and a shank (12) extended from the threaded portion. A ring (20) fitted on the shank has a ring thread (21) that ensures the continuity of the threaded portion of the bolt, and a shear zone (14) joins the shank to the threaded portion. The recesses (13A,13B) on the threaded portion engage with tabs (22A,22B) of the ring, to ensure rotation locking of the ring with respect to the threaded portion.</p> |
