Eclipse spring-engaged, servo motor brakes has a split hub, zero backlash clamp collar for attachment to the servo motor shaft in a variety of input and output flange/shaft combinations. Torque ranges 2–125 Nm, with low inertia, high tensional rigidity with no system wind-up, integral flanges that adapt to any servo motor and mounting style and NEMA 23, 34 and 42 frame sizes.