GERWAH couplings convince customers all around the globe by their unequalled quality. The new series ‘PKN’ combines the proved and tested technical advantages of a metal bellows coupling with those of a plug-in connection. In contrast to other comparable solutions, the GERWAH couplings do not need any axial pre-load. They easen the mounting of shafts, while remaining completely backlash-free and electrically isolating, and even compensating misalignments. The ‘PKN’ series is available for a wide range of rated torques. A metal bellows made of high-quality premium steel and hubs made of aluminium prolong the durability of this coupling.