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Document Type and Number:
Japanese Patent JP2019002439
Kind Code:
To provide a bolt which suppresses galling to a nut.SOLUTION: A bolt 1 is provided. The bolt 1 comprises a head 2 and a shank 3. The shank 3 includes: a normal screw part 10 which is meshed with a nut 100; and a guide screw part 20 which is provided closer to a tip than the normal screw part 10 and includes a thread 21 of a smaller diameter than a thread 11 of the normal screw part 10. In a tip of the guide screw part 20, a protection part 30 of a larger diameter than a diameter d2 of a root of the normal screw part 10 is formed continuously from the guide screw part 20. In a tip of the thread 21 of the guide screw part 20, a pressure flank surface 23 is formed but a clearance flank surface 22 is not formed.SELECTED DRAWING: Figure 1

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影山 正直
Application Number:
Publication Date:
January 10, 2019
Filing Date:
June 13, 2017
Export Citation:
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International Classes:
Attorney, Agent or Firm:
特許業務法人 信栄特許事務所

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