Press-fitting serration of bolt into bolthole of flange

摘要

A fastening structure comprising a bolt 5 provided with a serration 7 which is press-fit into a bolthole 3 formed through the flange portion 2 of a mounting member 1 avoids deterioration in flatness of a surface of the flange 2 by having the serration 7 spaced from respective end surfaces 2A and 2B of the flange portion 2 by first and second distances D and C which each exceed 13 % of the thickness A of the flange portion 2. With this arrangement, the serration 7 presses a bolthole inner peripheral surface 13 only in the region located far apart from both the end surfaces 2A and 2B of the flange portion 2. The flange portion may be part of a bearing ring member connected by bolts to a brake disc and a wheel in a vehicle.