| 摘要 |
<p>A special shape inner peripheral surface (14) connected to a base end side of a female thread (11) and set to be rotatable only by a first special purpose tool is formed in a nut main body (2). A cap (4) is constituted by a shaft portion (21) which is inserted to the special shape inner peripheral surface (14) of the nut main body (2) and having a male thread (23) threaded with a base end portion of the female thread (11) of the nut main body (2) in a leading end side, and a head portion (22) provided in a base end side of the shaft portion (21).</p> |
