Abrasive wheel assembly

An abrasive wheel assembly for use on a grinding or cut-off machine comprising:

• an abrasive wheel having a central aperture extending from a face portion of the wheel to a back portion of the abrasive wheel;
• bushing means including a sleeve portion received within the central aperture of the abrasive wheel to provide a reinforced opening, a first flange extending radially outward from the sleeve portion along the face portion of the abrasive wheel, and a second flange extending radially outward from the sleeve portion along the back portion of the abrasive wheel, the second flange providing at least one radially directed flat slot extending from the reinforced opening to a periphery of the second flange;
• and
• a hub having mounting means for releasably mounting the hub upon the machine, a third flange extending radially outward from the mounting means for abutment with the back portion of the abrasive wheel for facilitating alignment of the abrasive wheel, an axial extension received within the reinforced opening in the abrasive wheel, clamping means engaging the first flange to secure the hub to the abrasive wheel axially and a raised key portion extending radially relative to the axis of the hub in engagement with the flat slot of the bushing at a distance radially spaced outwardly from the axial extension to prevent rotation of the hub relative to the abrasive wheel.