Abstract: A collet for a threaded-end tool bit, seats a bit-engaging nut in its rear end portion. When the collet is clamped within a chuck, there is no radial interference between the nut and the collet body, thus permitting the gripping segments of the collet to remain in exact parallelism with the tool shank.

Abstract: A milling cutter is disclosed that comprises a rotatable adapter plate having a central protrusion on one side of the plate. A cutter ring, having recesses for mounting inserts therein, is provided with bayonet slots and a central opening so it can be fitted with and bolted to the adapter plate. The central protrusion is tapered and a conical grind is put on one of the mating surfaces between the adapter and the cutter plate to aid in disassembly after use of the milling cutter.

Abstract: A chuck assembly and collet for retaining an end mill tool against axial pullout. The collet includes a radially compressible body having a tapered outer surface, a central bore and a radial aperture extending from the outer surface into the central bore. The radial aperture, which includes larger and smaller diameter portions, has a movable pin mounted therein and adapted to extend into the bore to retain the tool. The pin has an undercut portion, with a spring or snap ring mounted around the pin in the undercut portion, said spring having a free diameter slightly larger than the larger diameter to provide a pressure fit when mounted therein.