Clamping device with planar contact

Clamping device comprising:

• a body including a central receiving opening configured to be concentrically located with a workpiece spindle axis;
• and
• an annular planar contact surface, which
• is configured to be concentrically located with the workpiece spindle axis,
• is located in a workpiece-side end region of the clamping device, and
• which extends at least substantially perpendicular to the workpiece spindle axis;
• wherein said clamping device is configured to clamp a gear workpiece comprising a head region and a shaft or a shank;
• wherein the workpiece-side end region includes at least one circumferential groove therein, said at least one groove at least one of
• extends from an outer surface of the clamping device radially toward the workpiece spindle axis or
• extends radially outwardly from an inner surface of the clamping device relative to the workpiece spindle axis;
• and
• wherein said at least one groove provides the clamping device with elasticity in a region of the planar contact surface.