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Harmonic Drive Gear

Harmonic Drive LLC

True Zero Backlash precision gears units and gearheads are available in a variety of sizes, ratios and configurations including Hollow Shaft versions which allow cables or shafts to pass through the center of rotation. Our Lightweight Gear Units provide outstanding Torque-to-Weight ratios while delivering zero backlash and positioning accuracy better than 1 arc-minute.

Harmonic Drive® gearing utilizes a unique operating principle which is based upon the elastic mechanics of metals. The greatest benefits are the zero-backlash characteristics and the weight and space savings compared to other gears because our gear mechanism consists of only three basic parts. They are the: Wave Generator, Flexspline andCircular Spline.

This simple three element construction combined with the unique operating principle allows extremely high reduction ratio in a very compact and lightweight package. Neither the size nor weight of the gear vary with the reduction ratio. The high performance attributes of this gearing technology including zero backlash, high torque, compact size, excellent positional accuracy and repeatability are all a direct result of the unique operating principle.

Zero backlash

  • Compact and simple design
  • High torque capacity
  • High stiffness
  • High positioning and rotational accuracies
  • Coaxial input and output


  • CSG high torque version offers 30% higher torque than CSF series.
  • Life for CSG series has been improved by 43% (10,000 hours) compared to the CSF series
  • Ratios: 50:1 ~160:1
  • Peak Torque 1.8~9200 Nm
  • Sizes 73~260mm


  • Ratios 30:1 ~ 160:1 (30:1 reduction ratio on 7 sizes)
  • Peak Torque 23~3400 Nm
  • Sizes 30~330mm

Harmonic Drive, LLC engineers and manufactures precision servo actuators, gearheads and gear component sets. We work closely with both Fortune 500 and companies of all sizes to understand their application requirements and provide a standard or custom-engineered solution to enable the success of their design project. The majority of the products sold by Harmonic Drive, LLC are proudly made at our manufacturing facility in Peabody, Massachusetts. Harmonic Drive Group Companies in, Japan (Harmonic Drive Systems, Inc.) and Germany (Harmonic Drive AG) provide additional products. We have shared core values, product designs and quality standards. State of the art manufacturing facilities in the US, Japan and Germany enables us to locally serve the needs of our global customers.
With over 50 years of experience, our expert engineering and production teams develop enabling technologies and products to meet the needs of an evolving motion control market. We are very proud of our outstanding company history. Our high-precision, zero-backlash Harmonic Drive® gears and Harmonic Planetary® gears have, and continue to play critical roles in robotics, spaceflight applications, semiconductor manufacturing equipment, factory automation equipment, medical diagnostics and surgical robotics. More information can be found by visiting the company’s website at www.harmonicdrive.net
Harmonic Drive is a registered trademark of Harmonic Drive Systems.

Model: CSF CSG



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