| 摘要 |
PURPOSE: An anti-loosening nut assembly is provided to make an upper nut not interfere with a lower nut, to easily connect the upper nut, to easily check the rotational degree of the upper nut, and to accurately decide the torque degree of the upper nut. CONSTITUTION: An anti-loosening nut assembly comprises an upper nut(3) and a lower nut engaged with each other in an eccentric manner to afford the wedging effect of surely inhibiting the upper nut and the lower nut from loosening. The upper nut has one or more lateral lugs(3a) to be brought into contact with the lower end of a fastening tool such as a spanner. The lug or lugs(3b) protrudes or protrude from the outer peripheral portion or portions of the upper nut for the purpose of visual detection of rotation angle of this nut.
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