A hand blender comprising: a tool unit comprising a tool unit coupling part ; and a motor unit for use in arrangement with the tool unit , comprising: a motor , comprising a motor shaft; an end part positioning the motor shaft on a longitudinal axis of the motor; wherein the end part further comprises a motor unit coupling part arranged to be coupleable to the tool unit coupling part of the tool unit ; wherein the motor unit coupling part comprises: an alignment zone for aligning the tool unit to the motor , comprising a first motor coupling surface having an axisymmetric shape; and a fixating zone for fixating the tool unit to the motor ; wherein the tool unit coupling part comprises a first tool coupling surface having a similar, compatible axisymmetric shape as the first motor coupling surface such that the tool unit coupling part may fit to the motor unit coupling part, characterized in that : the end part of the motor unit further comprises a second motor coupling surface arranged to fix the tool unit in a tangential direction, the second motor coupling surface having a non-axisymmetric polygonal shape with respect to the longitudinal axis (L); and the tool unit comprises a second tool coupling surface having a similar, compatible non-axisymmetric polygonal shape as the second motor coupling surface such that the tool unit coupling part may further fit to the motor unit coupling part . a tool unit comprising a tool unit coupling part ; and a motor unit for use in arrangement with the tool unit , comprising: a motor , comprising a motor shaft; an end part positioning the motor shaft on a longitudinal axis of the motor; wherein the end part further comprises a motor unit coupling part arranged to be coupleable to the tool unit coupling part of the tool unit ; a motor , comprising a motor shaft; an end part positioning the motor shaft on a longitudinal axis of the motor; wherein the motor unit coupling part comprises: an alignment zone for aligning the tool unit to the motor , comprising a first motor coupling surface having an axisymmetric shape; and a fixating zone for fixating the tool unit to the motor ; an alignment zone for aligning the tool unit to the motor , comprising a first motor coupling surface having an axisymmetric shape; and a fixating zone for fixating the tool unit to the motor ; wherein the tool unit coupling part comprises a first tool coupling surface having a similar, compatible axisymmetric shape as the first motor coupling surface such that the tool unit coupling part may fit to the motor unit coupling part, characterized in that : the end part of the motor unit further comprises a second motor coupling surface arranged to fix the tool unit in a tangential direction, the second motor coupling surface having a non-axisymmetric polygonal shape with respect to the longitudinal axis (L); and the tool unit comprises a second tool coupling surface having a similar, compatible non-axisymmetric polygonal shape as the second motor coupling surface such that the tool unit coupling part may further fit to the motor unit coupling part . the end part of the motor unit further comprises a second motor coupling surface arranged to fix the tool unit in a tangential direction, the second motor coupling surface having a non-axisymmetric polygonal shape with respect to the longitudinal axis (L); and the tool unit comprises a second tool coupling surface having a similar, compatible non-axisymmetric polygonal shape as the second motor coupling surface such that the tool unit coupling part may further fit to the motor unit coupling part . <EOS>