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; 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; 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; 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.