The RINGFEDER® TNZ coupling is a torsionally stiff coupling designed to have some backlash. It compensates for angular, radial and axial shaft misalignments within defined ranges. Radial shaft misalignment can only be accommodated by double engagement coupling designs with two flexing planes. The coupling transmits the torque via hubs with crowned teeth which are in permanent mesh with the straight teeth of the sleeves. The coupling is suitable for horizontal installation in every direction of rotation. To ensure long and reliable operation of the coupling, it is indispensable to grease it with a lubricant that complies with the specific requirements of this coupling.