| 摘要 |
<p>Disclosed are a slack preventive fastener for a screw tool formed in a relatively simple structure, easily manufacturable at low cost by mass production, and capable of easily and securely preventing a screw tool from being loosened as a fastener for a screw tool miniaturized or refined by precise processing for assembling various types of small-sized products; and a method and a device for manufacturing the fastener. The fastener comprises a fastening device (10) such as a nut, an insert, etc. to be fastened with the screw device such as a screw, a bolt, etc. A recessed part (18) formed by press-molding from the outside is provided in a part of the outer peripheral wall of the fastening device to form a diameter-reduced deformation part (20) where the diameter of the crest or bottom of a female thread is partially reduced in the inner peripheral wall of the fastening device.</p> |
