| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a fastening member having a high anti-loosening effect. <P>SOLUTION: The fastening member has a thread structure including an upper portion on the thread ridge top side and a lower portion on the thread root side. A pressure side flank surface formed at the upper portion is provided on the seat face side rather than the pressure side flank surface of a basic profile, and at least one side face of the lower portion is provided inside an extension of the corresponding flank surface. <P>COPYRIGHT: (C)2011,JPO&INPIT |
