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    138 mm Strain Wave Harmonic Drive Gearbox, Ratio 50~120

    5 out of 5 based on 1 reviews | Write a review
    Cost-effective 138 mm strain wave gearbox is the perfect solution for your high-precision motion control applications. It provides harmonic gear reduction and increases rotation speed. Buy a small harmonic drive wave gearbox with a 50~120 gear ratio for robotics and aerospace.
    SKU: ATO-HD-138
    30-day Returns
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    Delivery date: 6-12 days

    Get a cheap strain wave harmonic drive gearbox online. 50/80/100/120 reduction ratios for selection. High torque and precision harmonic reducer with a 138 mm diameter is the best solution for industrial robots.


    • It is a strain wave harmonic drive gearbox with high rigidity, no gear backlash and coaxial input and output.
    • The gearbox features excellent positioning accuracy and rotation accuracy.
    • Harmonic reducer with a high torque capacity and a high gear ratio is available.
    • 138 mm strain wave gearbox is designed for robots.


    • Model: ATO-CSF-32-I
    • Type: Self-aligning
    • Diameter: 138 mm
    • Thickness: 61.6 mm
    • Gear type: Cylindrical gear reducer
    • Installation form: Horizontal
    • Input speed: 3500 rpm
    • Rated power: 0.1 kW
    • Output speed: 0~500 rpm
    • Available torque: 1~100 N.m
    • Gear ratio: 50, 80, 100, 120, other gear ratios please contact us.


    Gear ratio 50 80 100 120
    Rated torque when input 2000r/min (N.m) 76 118 137 137
    Allowable peak torque at start and stop (N.m) 216 304 353 353
    Maximum allowable average load torque (N.m) 75 167 216 216
    Momentary allowable maximum torque (N.m) 200 568 647 686
    Allowable maximum input speed (r/min) 4500
    Allowable average input speed (r/min) 3500
    Arc seconds ≤20 ≤10 ≤10 ≤10

    Dimensions (unit: mm)

    138mm harmonic drive gearbox dimensions.

    Harmonic Drive Gearbox Applications

    ATO harmonic drive gearboxes can be used to optimize the shape of robots, increase precision, increase strength, improve flexibility, etc., and are widely used in industrial robots, numerical control equipment, medical instruments, military and other fields.

    Harmonic drive applications

    Tips: Harmonic Drive Gearbox Troubleshooting

    • During use, the vibration of the harmonic drive gearbox increases, and the noise increases. The main reason is that the components inside the case are too worn or damaged.
    • The gear tooth surface is worn, the gear shaft hole or keyway is worn; the screw hole at the bearing hole is worn; the shaft surface is worn. The precision of parts can be restored by electroplating.

    In order to ensure the service life of the hard tooth surface harmonic reducer, it is necessary to strictly select the type, ensure its safety factor, and operate in strict accordance with the instructions, so as to prolong the service life of the harmonic reducer.

    Installation Manual

    PDFATO Harmonic Drive Gearbox Installation Manual

    Precautions for installation

    1. When the harmonic drive gearbox is in use, if the output end is horizontally downward, the lubricating grease injected into the inner wall space of the flexspline must exceed the meshing tooth surface.
    2. The installation plane of the rigid wheel and the rigid wheel connection and the installation plane of the flexible wheel and the flexible wheel need to be statically sealed to ensure that the grease will not leak during the use of the harmonic drive gearbox and avoid the reducer from working with little or no oil Time damage.
    3. During the installation process, please do not knock the parts of the harmonic drive gearbox with hard objects, or apply strong pressure to avoid damage to the parts.
    4. If you have any questions during the inspection, please contact ATO.

    Tips for using a harmonic drive gearbox

    • Please use it in the specified environment.
      Observe the following conditions when using a harmonic drive gearbox:
      Ambient temperature: 0-40 degrees Celsius, no splashes of water, oil, etc.; no corrosive, explosive gas; no dust such as metal powder,
    • Please use the prescribed method for installation.
      Please implement the installation method correctly according to the harmonic drive gearbox manual. If it is not installed correctly, it may cause vibration, loss of accuracy, shortened service life, damage and other failures.
    • Please use the specified lubricant.
      Failure to use the specified lubricant may result in reduced harmonic drive gearbox life.
      Please do not disassemble or reassemble the product, otherwise, it will not be able to restore its original performance.
      Do not exceed the allowable torque during use, otherwise, it may cause harmonic drive gearbox failure.
    Existing reviews of 138 mm Strain Wave Harmonic Drive Gearbox, Ratio 50~120
    What are the lead times for drive gearbox?
    Thank you for your reply. The custom specs are TBD . But let's say for example, I would want the specs of the 138mm harmonic gearbox with 50 gear ratio but with maximum allowable average load torque to be in the 120~130 nm range in a 70~80mm outer diameter gearbox. Is this something that is possible?
    If so, what are generally the lead times for these orders? Thank you!
    From: nealon | Date: 05/04/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Unfortunately, we do not provide such specifications. If the maximum allowable average load torque of the gearbox is required to reach 120~130nm, the outer diameter of the gearbox can only be 138mm or 142mm, not 70-80mm.
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