Abstract: A granulator which has a rotor knife seat having a plurality of tapped holes and a clamp to secure a knife to the rotor seat, is set forth. The granulator further includes a floor formed in the rotor seat and a trapezoidal shaped knife having a rear wall. The knife has an upper surface and a forward sloping surface, the sloping surface terminating at one end in a cutting edge and intersecting at its other end the upper surface and defining at said intersection a knife alignment edge. An adjustable clamp having a plurality of bolt holes is also provided. The clamp may be moved with reference to the rotor seat within the limits defined by the diameters of the bolt holes.