Grinding mills used in the field of wood processing for example produce high-quality fibres for MDF, HDF and insulation panels. By request of and in close cooperation with a renowned plant manufacturer, RINGFEDER® has designed a special gear coupling of the TNZ series, which meets specific requirements of the application: The coupling implements maximum torque transmissions between the grinder and the driving motor and furthermore provides for axial offset compensation, which is indispensable due to the axial adjustability of the grinder. Moreover, the flexible coupling solution is characterised by an exactly defined torsional flexibility preventing excess or early wear or failure of the grinding plant, which would otherwise cause increased costs for the user.