| 摘要 |
To provide a fastener that is able to prevent the tightening nut from loosening over an extended period. The anti-loosening fastener comprises a bolt that has a head and a shank, where the shank comprises a root-side of a large diameter and an end-side of a small diameter, the root-side has a tightening thread formed on it in one turning direction, the end-side has an anti-loosening thread formed on it in the other turning direction, and the minor diameter of the tightening thread is greater than the major diameter of the anti-loosening thread; a tightening nut is screwed on the tightening thread; and an anti-loosening nut is screwed on the anti-loosening thread with the front end in contact with the rear end of the tightening nut and may have the same outer dimensions as the tightening nut.
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