The Quantum Series from HD Systems is the highest torque capacity harmonic gearhead that the company has ever produced. According to HD Systems’press release, the gearhead delivers 50% more torque than the CSF Series. It can maintain 1 arc.-min. positional accuracy and +/-5 arc-sec repeatability. With an outer diameter of 79 mm and a length measurement of 45 mm, the gearhead is available in gear ratios of 50,80, 100, and 120:1.