The sleeve flange type mounting device (1) consists of a sleeve flange defining a sleeve portion and a flange portion. A pressing plate is fitted on the sleeve portion for clamping the grinding wheel on the flange portion. A cover is fitted on the pressing plate and three balance weights are received in a circular recess defined by the pressing plate. Each having a first arc-shaped side abutting against a far wall near a circumferential periphery of the pressing plate and a second arc-shaped side abutting against a circumferential periphery of the cover. There is a nut threadedly engaging an extremity of the sleeve portion and exerting a compressive force on the cover.
