| 摘要 |
PROBLEM TO BE SOLVED: To reliably tighten a mounting object for a structure by securing the spherical contact between a nut and a washer in all directions when the mounting object is slantly tightened by a bolt and a nut. SOLUTION: This structure of a pair of the nut and the washer wherein the bearing surface of the nut 5 for the washer 6 for screwing the bolt is made a convex surface 11, and the bearing surface of the washer 6 for the nut 5 is made a concave surface 13.
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