Mechanically operated machine clamping tools, namely, clamps, vices, jaws, expansion arbors, expansion chucks, spindles for use precision clamping of work pieces onto processing machines, other than for the building industry and also other than in the field of manufacturing prefabricated components for buildings, in particular prefabricated frameworks and walls; mechanical clamping elements and systems for clamping tools and tool pieces in processing machines, in particular power-operated hydraulic axial clamping elements and systems, namely, hollow-piston cylinders, spring clamping cylinders, clamping bar, expansion arbors, expansion chucks, spindles; bearings and bushings; bushings being parts of machines; bearing housings; bushings for the keying of rolling bearings; machine parts, namely, hydraulic expansion chucks; chucks for holding a workpiece in a lathe; components for machines and machine tools, namely, chucks for drilling machines, gears, hobbing machines, grinding machines; self-centering chucks for drilling machines, gears, hobbing machines, grinding machines; drill chucks for power drills; components for machines and machine tools, namely, jigs for holding a component during machining; components for machines and machine tools, namely, mechanical sliding sleeve expansion arbors and chucks