Shaft couplings are central components in drive technology and mechanical engineering because they connect shafts and enable efficient power transmission. The selection of the appropriate shaft coupling, such as e.g., a linear coupling as a non-rotary coupling, can, however, be difficult due to the wide variety of coupling types. This article introduces various selection criteria, such as motor power, required torque, and torsional characteristics, and provides guidance on designing the perfect shaft for your application.