Unlocking-resistant and loosening-resistant nut assembly

An unlocking-resistant and loosening-resistant nut assembly comprising a conic nut and a wedge washer, characterized in that the conic nut comprises a conic portion, a force application portion, and a first wedge face formed on a bottom surface of the conic nut, the force application portion being a hexagonal prism to enable force application thereto by a socket or open-ended wrench, the conic nut having an overall thickness corresponding to thickness specifications of M6 to M18 metric nuts, the force application portion having a thickness of which a thickness ratio with respect to the overall thickness is between 1:3 to 1:5, the conic portion having a curved contour that shows a concave curve,

• the wedge washer comprising a circular washer having a diameter greater than the conic nut, the wedge washer having a surface on which a second wedge face that is configured to correspond to the first wedge face of the conic nut is circumferentially formed and an opposite surface forming at least one sharp fitting rib that has a cross-section comprising a right-angle having a hypotenuse extending in the direction of tightening the conic nut.