| 摘要 |
PROBLEM TO BE SOLVED: To prevent seizure caused when a bolt is inserted into a nut in an eccentric or inclined condition. SOLUTION: A diameter d1 of a barlike part 1b connected with a tip of a screw part 1a is reduced than a diameter d2 of a screw bottom. A tip of the barlike part 1b is formed into substantially semi-spherical shape which is one example of curved face shape.
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