| 摘要 |
PROBLEM TO BE SOLVED: To provide a falling-out preventive structure of a bolt capable of firmly retaining connection of members by preventing the bolt once screwed from loosening and falling-out. SOLUTION: The falling-out preventive structure of the bolt comprises a through-hole (4) drilled to a longitudinal direction of the bolt (1), a fissure portion (5) formed along the through-hole (4), and a pin inserted into the through-hole (4).
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