Abstract: An anti-loosening bolt assembly includes a bolt having a bolt head and a bolt shank; a fixed nut having second threads on an inner circumferential surface thereof; and a washer, wherein the bolt head includes a plurality of locking protrusions, each of the locking protrusions having an inclined locking surface and a vertical locking surface, the washer includes a plurality of stop protrusions, each of the stop protrusions having an inclined stop surface and a vertical stop surface, and a magnetic member is provided in the washer such that the magnetic member maintains a combined state of the washer with an objective member using a magnetic force, so that when a rotational force is applied to the bolt in the loosening direction, the inclined locking surface is stopped by the inclined stop surface, thereby preventing the bolt from loosening and rotating.

Abstract: An anti-loosening bolt assembly includes a bolt having a bolt head and a bolt shank; a fixed nut having second threads on an inner circumferential surface thereof; and a washer, wherein the bolt head includes a plurality of locking protrusions, each of the locking protrusions having an inclined locking surface and a vertical locking surface, the washer includes a plurality of stop protrusions, each of the stop protrusions having an inclined stop surface and a vertical stop surface, and a magnetic member is provided in the washer such that the magnetic member maintains a combined state of the washer with an objective member using a magnetic force, so that when a rotational force is applied to the bolt in the loosening direction, the inclined locking surface is stopped by the inclined stop surface, thereby preventing the bolt from loosening and rotating.