# Harmonic Drive SHG-20-100-2UH Hollow-Shaft Strain-Wave Gear Unit

Benchmark size-20 100:1 high-torque silk-hat hollow-shaft gear unit; the standard for cable-through robot joints.

- Maglev ID: ac-harmonicdrive-shg-20-100-2uh
- Brand: Harmonic Drive
- MPN: SHG-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: 52 N·m at 2,000 rpm input
- Peak torque (repeated / momentary): 107 N·m repeated (start/stop) / 191 N·m momentary
- Backlash: Zero backlash (maker claim; no arcsec figure published)
- Outer diameter: 90 mm (φA h7, SHG-20-2UH)
- Hollow shaft: yes (hollow-shaft unit)

## Links
- Product: https://www.harmonicdrive.net/products/gear-units/hollow-shaft-gear-units/shg-2uh
- Datasheet: https://www.harmonicdrive.net/_hd/content/documents1/SHG-SHF_GearUnits.pdf
- CAD: none

## Equivalents
- Leaderdrive LHSG-20-100 High-Torque Hat-Type Strain-Wave Reducer (ac-leaderdrive-lhsg-20-100)
- KOFON KBG-HO-20-100 High-Torque Hollow Hat-Type Strain-Wave Reducer (ac-kofon-kbg-ho-20-100)
- Nidec FLEXWAVE WPU-50-100-SRH Hollow-Shaft Strain-Wave Unit (ac-nidec-wpu-50-100-srh)
- Han's Motion HMHG-20-100-I Hollow Harmonic Reducer (ac-hansmotion-hmhg-20-100-i)

## Sources
- https://www.harmonicdrive.net/products/gear-units/hollow-shaft-gear-units/shg-2uh (SHG-2UH table: SHG-20-100-2UH torques; mass 1.38 kg)
- https://www.harmonicdrive.net/_hd/content/documents1/SHG-SHF_GearUnits.pdf (outline dimensions table (outer diameter))