| 摘要 |
<P>PROBLEM TO BE SOLVED: To positively suppress dispersion of a torque coefficient by improving a screw contact part of a bolt to a nut and effectively stabilize tightening axial force. Ž<P>SOLUTION: The bolt 1 has a head part 11 and a shaft part 12, and a male screw 15 is formed on the outer periphery of the shaft part 11. A torque coefficient stabilization part 15a swollen outwardly is provided on a thread flank of the male screw 15 of the shaft part 11, so as to identify a contact position of a female screw of a nut with respect to the thread flank. By making a distance from the center of the bolt 1 to the contact position fixed and making the contact area fixed, the torque coefficient is stabilized. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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