The AP Series is a high precision rotary flange style planetary gearbox with less than 1 arc minute backlash. Case Hardened and ground gearing provide high accuracy and high wear resistance for the gear train. The addition of a fourth planet gear increases torque capacity up to 29% Compact structure provides high torsional rigidity, taper roller bearing support provides high axial and moment load capacity. NEW larger sizes available - AP 285 / AP355 / AP450able for Rack & Pinion Applications