| 摘要 |
PROBLEM TO BE SOLVED: To provide a nut member for cross bolt effectively achieving lock effect.SOLUTION: A fitting nut concave part includes a hexagon nut cut for providing female thread, and a fitting groove constituted by an annular groove having a larger diameter than that of the female thread at the bottom of the female thread. On the other hand, a fitting nut convex part includes a hexagon nut cut for providing female thread, and a fitting portion at the top of the nut. The fitting nut concave part and the fitting nut convex part are combined. |
