A wheel bearing device having an outer ring with an attachment flange and
two rows of raceway surfaces in the inner periphery, a hub ring having a
wheel-attaching flange and one raceway surface in the outer periphery, an
inner ring fitted on a stepped portion of the hub ring and having the
other raceway surface in the outer periphery, and two rows of rolling
elements. The end of the hub ring is crimped for integration, wherein the
pre-crimping end on the hub ring is a hollow cylindrical portion with
wall-thickness gradually increases toward the front end. Crimping imparts
preload to the rolling elements and is effected by measuring the
before-crimping axial dimension and controlling the lower dead point of a
crimping punch according to the axial dimension so that the worked head
height of the crimp portion is made constant.
