| 摘要 |
<p>Provided is a fastening member for appropriately ensuring strength of a peripheral edge part of a tapered-cylindrical-body-shaped part and appropriately reducing external dimensions. The fastening member is, for example, a bolt, a nut or a washer employed for fastening a body being fastened by a screw tightening action, the fastening member has a tapered-cylindrical-body-shaped part (12) formed into a cylindrical body shape with a gradually increasing diameter toward a seating surface (13) formed into a circular-planar-band-ring-shape concentric with an axis so as to press against the body being fastened, the taper angle of the tapered-cylindrical-body-shaped part (12) is an acute angle, and an upright surface (12c) is formed on an outer circumferential surface of the tapered-cylindrical-body-shaped part (12) and vertically erected from the body being fastened, so that an outer diameter of the circular-planar-band-ring-shaped seating surface (13) has a size in a range for creating a surface pressure from the seating surface (13) so as to effectively press against the body being fastened.</p> |
