| 摘要 |
PROBLEM TO BE SOLVED: To provide a screw component capable of easily fastening a fastened member in a location where a working space is narrow or visibility is poor. SOLUTION: A slanting installation of a fastening tool is practical so that a slant face in which a polygon formed on the top surface is widened toward from the tip of a head portion to a lower portion is arranged in the head portion as a connecting portion with the fastening tool. Or, upon arranging a polygonal ball-shaped bulging portion 22 in section in the head portion 21 and also forming a narrow part 27 between the ball-shaped bulging portion 22 and a seated surface 25, the fastening member is tightened by slantly installing the fastening tool such as a socket wrench.
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