Abstract: A rotatable cutting bit, and rotatable cutting bit-bit holder assembly and washer that have increased wear resistance characteristics. The assembly incorporates a new holding washer design that has improved wear resistant characteristics between the cutter bit and top surface of the bit holder during operation. The cutter bit assembly includes a bit holder having a top surface, a generally flat washer, the top surface includes a top face forming a bearing surface for the cutting bit to enhance rotation of the cutter bit. The wear rate caused by the relative rotation between the rear face of the washer and top surface of the block face is reduced in the present invention. The top surface of the bit holder is hardfaced to limit and reduce wear. The improved wear resistance properties of the invention reduce the amount of necessary maintenance of rotary drums in the field resulting in reduce downtime and increase productivity.

Abstract: An assembly that includes a rotatable cutting tool and a tool holder. The rotatable cutting tool has an integral enlarged dimension portion mediate which has a periphery and a rearwardly facing surface which defines a generally planar shoulder. The tool holder includes a bore and has an integral mating surface which surrounds the forward end of the bore. The mating surface has a peripheral edge. The rotatable cutting tool is rotatably retained in the bore of the tool holder body so that the shoulder of the elongate cutting tool body contacts the mating surface of the tool holder body and the periphery of the enlarged dimension portion of the elongate cutting tool body extends radially outwardly past the peripheral edge of the mating surface.