Abstract: A mounting device in the form of a substantially annular washer allows a bearing having relatively movable bearing rings to be blind mounted in a bearing seat in a housing or on a shaft. The washer is fitted to one of the bearing rings and abuts a side face of the other bearing ring to transfer an axial mounting force between the two bearing rings to mount one of the bearing rings in the bearing seat. The washer is tapering and assumes a first stable position to transfer axial force sufficient to push one of the bearing rings into its seat and an unstable region encountered after the one bearing ring has reached its mounted position. Under continued axial force, the washer flexes away from the side face of the other bearing ring to an inverted tapering, second stable position, with a passage between the bearing rings being opened.