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For such applications, torsionally rigid flexible couplings are generally ideal. The thin metal bellows have in addition to the balancing, also vibration-damping properties. The high flexibility of Jakob’s KSS couplings with its 2-wave bellows and straight adapter and the easy mounting option of the coupling through the use of cone bushings as a shaft-hub connection guarantee a safe transmission of all forces and torques, even with small shaft diameters and torques without additional feather key. The rotationally symmetric design ensures excellent, dynamic operating behavior, even at very high speeds. The high torsional rigidity and the very low restoring forces with shaft misalignment as well as the low moment of inertia characterize the coupling type. Torques from 25 to 2500 Nm are possible. Highest quality in processing and the materials used make the KSS couplings a reliable and economical component. It is used, in addition to the test stands as a highlighted example, also particularly often in servos and actuators.