THE HARD LOOSING BOLT AND NUT

摘要

PURPOSE: A bolt and a nut difficult to loose are provided to form a predetermined slope to a right intorsion direction in a head portion and a lateral side of a hexagonal headed bolt, thereby preventing a bolt and a nut being easily loosen. CONSTITUTION: A bolt(20) and a nut(10) difficult to loose comprises a head portion and a screw body. The head portion and the screw body are integrated. A lateral side of the head portion is formed to be tilted toward a right intorsion direction at a predetermined inclination.