| 摘要 |
<p>The present invention relates to a self-locking nut which prevents a nut from arbitrarily loosening from a spiral shaft of a bolt even if an external vibration occurs while being handled as the spiral shaft is spirally coupled to a spiral hole tightly by a tension force by rendering a portion of the spiral hole of the nut inwardly with a self tension force especially when the spiral shaft of the bolt penetrates through the spiral hole of the nut while being spirally coupled thereto. In addition, the self-locking nut can be reused by enabling the bolt and the nut to be released without causing damage to the spiral shaft and the spiral hole of the nut. The present invention comprises: a spiral hole in the center so that a spiral shaft of a bolt penetrates therethrough while being spirally coupled thereto; and a nut of which the outer circumferential surface has a hexagonal shape. Moreover, the self-locking nut includes: a recessed groove portion that enables each side of the nut to have a small thickness (t) by being vertically recessed toward the inner side up to the upper end surface with an intermediate point as its starting point; and a tightening tension portion having a pressing tension piece that enables a portion having a small thickness to tightly hold the spiral shaft by pressurizing the portion having a small thickness from the outside to the inside through the recessed groove portion to be inwardly curved while having the self tension force.</p> |
