| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a fastening member having a high looseness prevention effect.SOLUTION: A fastening member has a screw structure, and comprises an upper part on a screw peak side and a lower part on a screw root bottom side. A play-side flank face formed at the screw peak and the upper part has a side face inclined toward a shaft tip side more than a play-side flank face of a reference chevron, and provided on an inner side than an extension line of a flank face corresponding to the upper part on at least one lower part. The side face is formed continuously from a lower end of the corresponding flank face.</p> |
