A coupling mechanism for a medication delivery device which is embodied in a housing. The coupling mechanism comprises a first part having a longitudinal axis and which is axially fixed with respect to the housing and rotatable around the longitudinal axis, the first part having a gearing engagement to a second part which is arranged along the longitudinal axis, the gearing engagement having a first frictional resistance. The second part is axially moveable along the longitudinal axis, and directly or indirectly in a friction fit engagement with respect to the housing, the friction fit engagement having a second frictional resistance. The coupling mechanism is characterized by that the first frictional resistance is below the second frictional resistance such that a rotation of the first part in a first rotation direction axially moves the second part away from the first part along the longitudinal axis and a rotation in a second rotation direction which is opposite to the first rotation direction reduces the axial distance between the first and second part and/or axially moves the second part in coupling abutment with the first part.
