Stepper Gear Motor:ry 1, speed of the motor can be easily controlled 2, it made up of a stepper motor and a planetary gearbox Technical Datas of Stepper gear motor 52PA/57BYGPLANETARY GEAR STEPPER MOTORHousing Material: MetalBacklash at No-load: ≤1.5°Bearing at Output: Ball or SleevePermissible Overhung Load: ≤20KgPermissible Thrust Load: ≤10KgMax. Radial Play: ≤ 0.05mmMax. Thrust Play: ≤0. ...