The article considers the possibility of using a standard method for calculating the transmitted torque of an end magnetic coupling with thin high-coercive permanent magnets 4.5 mm thick from a samarium-cobalt rare-earth alloy (KS-25DC). The air gap between the magnets in the half-couplings of the end coupling varies from 5 to 20 mm. Based on the results of the research, correction coefficients were introduced into the method for calculating the transmitted torque of an end magnetic coupling with thin magnets. It is noted that end magnetic couplings are used with an air gap between the magnets of the half-couplings in the range of 5–12 mm.