The Single Flex 6A-A1C version of the backlash-free composite disc coupling allows compensation of very high shaft misalignments in axial and angular direction. The compact aluminum clamping hub design of the single cardanic version offers very low weight and inertia. The innovative design of the spring pack guarantees high torsional stiffness with long service life in continuous operation. Especially for applications with a demanding requirement profile in terms of operating speed, load change (reversing operation) or repeatability, the clamping hub design 6A-A1C is an optimal choice.