| 摘要 |
The fastening element comprises a flat portion (11) formed on the end of a bolt (10), a nut (12) having a hexagonal head (12') and a cylindrical portion (12"), a body (13) having a hexagonal groove (14), a through hole (15) and a spacing portion (16) formed with a saw tooth (17) on the periphery of the body (13), the nut (12) inserted in the body (13), a spring (21) elastically mounted between a washer (20) fixed to the lower of a cylindrical projection (15') and a cylindrical portion (12"), an inserting element (18) having the hole (18') corresponding to the flat portion (11) formed with a saw tooth (19).
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