From now on are available for sale the new Nema 23 stepper motors (57 mm flange) with IP65 protection.
These stepper motors are built with magnets and techniques to maximize the efficiency and to have an holding torque 20% higher than the standard hybrid stepper motors with the same size. The available holding torque ranging from 0.5 up to 2.3 Nm with only 77 mm motor body length.