Retainer sleeve and washer for cutting tool

An apparatus for mounting a cutting tool includes a retainer sleeve that defines at least one retention groove adjacent an axial forward end thereof and a washer removably attached to the retainer sleeve. The washer has a forward surface, a rearward surface and an interior surface that define a central opening, wherein the interior surface includes at least one protrusion extending inward into the central opening that is structured and arranged for cooperating with the at least one retention groove in the retainer sleeve. The retainer sleeve further defines a longitudinal slot that extends from an axial forward end to an axial rearward end of the retainer sleeve. The washer further includes a key extending inward into the central opening that is structured and arranged for cooperating with the longitudinal slot in the retainer sleeve.