DOUBLE NUT FOR ANTI-LOOSE

摘要

PURPOSE: A double nut for loosening prevention is provided to prevent a bolt and a fastening nut which are screw-fastened from being easily loosened as screw threads of the bolt and the fastening nut are supported by being closely adhered to each other by an elastic force. CONSTITUTION: A double nut (100) for loosening prevention comprises a fastening nut (110) and a fixing nut (130). The fastening nut is screw-fastened up a bolt (200). The fixing nut is screw-fastened in an end portion of the bolt where the fastening nut is fastened, thereby preventing the fastening nut from being loosened. The fastening nut cuts a part of the fastening nut in a lateral side of a direction orthogonal to through-holes (111,131) where the bolt is screw-fastened, thereby forming a cut groove (115) generating an elastic force in a direction where the fastening nut is fastened up the bolt.