| 摘要 |
PROBLEM TO BE SOLVED: To exhibit a locking function resistant to an external force such as a vibration by enhancing a screw contact surface pressure while a length of screw and a fastening torque are made constant. SOLUTION: A total area of a screw contact surface is reduced by intermittently disposing a screw thread at a female screw side while a length of screw and fastening torque are made constant. As a result, a unit surface pressure of the screw contact surface is enhanced.
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