| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a guideless bolt capable of effectively preventing seizure due to oblique integration.SOLUTION: The starting end part of a thread includes a thread rising part 11 having a shape of being bent with a thread apex as a boundary, and a protective part 12 protecting the thread rising part 11 from damage due to interference between a male screw and female screw.</p> |
