Provides a mechanical connection and centring between rotor and machine shaft Backlash free, torsion-proof transmission of torque generated by the torque motor High true run accuracy between rotor and a stator mounted on the machine Low contact pressures exerted on machine shafts or hollow shafts Taper Collet chemically nickel-coated to prevent fretting corrosion Easily removable clamping element, even after long periods of operation