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    20x20 mm Strain Wave Harmonic Drive Gearbox, Ratio 30~80

    Low price 20x20 mm harmonic drive is a strain wave gear that provides high transmission accuracy and supports a single-stage high reduction ratio with low inertia. Small harmonic drive gearbox works with a 30/50/80 gear ratio, which is a simpler solution for your high-precision motion control applications.
    SKU: ATO-HD-20
    30-day Returns
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    Delivery date: 6-12 days

    20x20 mm small harmonic drive gearbox is used for industrial robots, CNC equipment, medical instruments, military industry. Low-price strain wave gearbox with 30/50/80 gear ratios can provide harmonic gear reduction, but can also be used to increase rotation speed.


    • 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.
    • 20x20 mm strain wave gearbox is designed for robots.


    • Model: ATO-CSF-05-XX-1U-U
    • Output/Input: Shaft Input, Shaft Output
    • Diameter: 20x20 mm
    • Thickness: 38 mm
    • Gear type: Cylindrical gear reducer
    • Installation form: Horizontal
    • Input speed: 6500 rpm
    • Rated power: 0.38 kW
    • Output speed: 0~500 rpm
    • Available torque: 40 N.m
    • Number of stages: Single-stage
    • Gear ratio: 30, 50, 80, other gear ratios please contact us.


    Gear ratio 30 50 80
    Rated torque when input 2000r/min (N.m) 0.25 0.4 0.52
    Allowable peak torque at start and stop (N.m) 0.5 0.9 1.35
    Maximum allowable average load torque (N.m) 0.38 0.53 0.84
    Momentary allowable maximum torque (N.m) 0.9 1.8 2.5
    Allowable maximum input speed (r/min) 10000
    Allowable average input speed (r/min) 6500
    Moment of inertia (1/4GD) (kgcm2) 2.5x10-7
    Arc seconds ≤20 ≤10

    Dimensions (unit: mm)

    20x20mm harmonic drive 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: What is an industrial robot?

    Industrial robots are mainly used in multi-joint manipulators or multi-degree-of-freedom machine devices in the industrial field. They have a certain degree of automation and can rely on their own power sources and control capabilities to achieve various industrial processing and manufacturing functions. Industrial robots are widely used in various industrial fields such as electronics, logistics, and the chemical industry. Purchase a harmonic gearbox for industrial robots to reduce movement speed, increase torque, improve motion accuracy, and ensure the stability and reliability of the motion process.

    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.
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