LOCKING BOLT AND METHOD FOR MANUFACTURING SAME

摘要

It is an object to provide a locking bolt, which is capable of tightly fixing a member or the like at an extremely high degree of firmness without being loosened even when vibrations are repeatedly applied thereto, and is manufactured in an extremely facililated manner. The locking bolt includes: a shank section (1) threaded on an outer circumference thereof; and a head section (2) provided at one end of the shank section (1). The head section (2) includes: a main body portion (201) having a hexagonal cross-sectional shape; and a cylindrical skirt portion (202) provided continuously with the main body portion (201) and formed so as to be spaced radially outward from the main body portion (201) in an expanding manner along a concave surface using a catenary curve surface. The locking bolt has a structure in which: a lower edge surface (203) of an outer surface of the cylindrical skirt portion (202) is parallel to an axis (X-X) of the main body portion (201); and an inner surface of the cylindrical skirt portion (202) is hollowed into an inverted catenary curve surface-like shape with a flat portion left on a bottom rim (204).