# Harmonic Drive CSD-20-100-2UH Ultra-Flat Strain-Wave Gear Unit

Benchmark size-20 100:1 ultra-flat cup-type gear unit for axially short joints.

- Maglev ID: ac-harmonicdrive-csd-20-100-2uh
- Brand: Harmonic Drive
- MPN: CSD-20-100-2UH
- Category: actuators / Strain-Wave (Harmonic) Reducers
- Origin: JP (maker HQ, factory not confirmed)
- Maker: Harmonic Drive LLC / Harmonic Drive Systems (brand, JP)
- NDAA: unknown · Blue UAS: unknown · FCC: n/a
- HTS: 8483.40.50.10
- MOQ: unknown · Lead time: unknown
- Confidence: VERIFIED

## Price
- No public price. Request a quote via POST /api/rfq or the order pad.

## Specifications
- Ratio: 100:1
- Rated torque: 28 N·m at 2,000 rpm input
- Peak torque (repeated / momentary): 57 N·m repeated (start/stop) / 95 N·m momentary
- Backlash: Zero backlash (maker claim; no arcsec figure published)
- Outer diameter: 70 mm (φA h7, CSD-20-2UH dimension table)
- Hollow shaft: no

## Links
- Product: https://www.harmonicdrive.net/products/gear-units/gear-units/csd-2uh
- Datasheet: https://www.harmonicdrive.net/_hd/content/documents1/CSD_GearUnits.pdf
- CAD: none

## Equivalents
- Leaderdrive LHD-20-100 Ultra-Flat Hollow-Shaft Strain-Wave Reducer (ac-leaderdrive-lhd-20-100)
- Laifual FHD-20-100 Ultra-Short Strain-Wave Reducer (ac-laifual-fhd-20-100)

## Sources
- https://www.harmonicdrive.net/products/gear-units/gear-units/csd-2uh (CSD-2UH table: CSD-20-100-2UH torques; mass 0.65 kg)
- https://www.harmonicdrive.net/_hd/content/documents1/CSD_GearUnits.pdf (outline dimensions table (outer diameter))