| 摘要 |
PROBLEM TO BE SOLVED: To provide an axial force visually confirmed bolt in which a clearance of the bolt, a state of a sheared flange portion, or designated fastening axial force at a head position is visually confirmed with ease and for everybody without making use of special measuring tools for control of the designated fastening axial force in an assembling workshop, outdoor fastening works, and the like. SOLUTION: A hollow columnar metal 3, in which a metal 2 softer than those of a head portion 1 of a bolt and a tapered neck portion 4 is assembled, is assembled between the head portion 1 of the bolt and a fastened body 8A. The tapered neck portion 4 is arranged for setting a tapered angle of intruding force of the metal 2 softer than the head portion 1 of the bolt and tapered neck portion 4 in response to the fastening axial force to be established. When the axial force is generated during a fastening process, the hollow columnar metal 3 assembling the metal 2 softer than those of the head portion 1 of the bolt and tapered neck portion 4 is intruded into the tapered neck portion 4 of the bolt, so that the clearance S becomes zero due to the established fastening axial force.
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