Strain-wave (harmonic) gear
Harmonic Drive CPU-M / CPU-H / CPU-S gear units
A strain wave gear unit with an integrated tilt-resistant output bearing. It comes in motor-mount (M), hollow-shaft (H) and input-shaft (S) versions.
Key specifications
| Bore (max) | 70 mm |
|---|---|
| Peak torque (max) | 1,840 Nm |
| Ratio | 30–160:1 |
| Backlash (max) | 0 arcmin |
| Sizes | 14-58 (nine sizes; individual sizes not listed on page) |
Summarised in our own words from Harmonic Drive SE / Harmonic Drive LLC's published data; series maxima, individual models vary. Last checked 2026-10-29. Source 1 · Source 2
Notes on this data
Harmonic Drive SE gives sizes 14–58 (nine sizes) and ratios 30, 50, 80, 100, 120 and 160. Repeatable peak torque is 9–1840 Nm (peak field = repeatable peak, not momentary). Tilting moment is 73–2222 Nm, and the CPU-H hollow shaft is 14–70 mm. The units are based on HFUC gear component sets. Rated torque and input speed are not on the page; the CPU catalogue PDF (48 MB) was not parsed.
Specify Motion is not affiliated with Harmonic Drive SE / Harmonic Drive LLC. Harmonic Drive and CPU-M / CPU-H / CPU-S gear units are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Typical applications
Alternatives that meet or exceed these figures
Engineers often come to us with a Harmonic Drive part number and leave with an alternative that is easier to source, quicker to deliver or a better fit for the machine. These 3 series from our supply network are the closest match on published figures.
Cup-type strain-wave gear component sets for building your own joint; the LCSG high-torque version lifts capacity by around 30% over the standard LCS.
| Published maximum | CPU-M / CPU-H / CPU-S gear units | LCS / LCSG |
|---|---|---|
| Peak torque | 1,840 Nm | — |
| Ratio (max) | 160:1 | 500:1 meets or exceeds |
| Backlash (lower is better) | 0 arcmin | — |
Hollow-shaft strain-wave gear units with a large central bore for routing cables and services; LHSG is the high-torque version (over 30% more torque).
| Published maximum | CPU-M / CPU-H / CPU-S gear units | LHS / LHSG |
|---|---|---|
| Peak torque | 1,840 Nm | — |
| Ratio (max) | 160:1 | 500:1 meets or exceeds |
| Backlash (lower is better) | 0 arcmin | — |
Ultra-flat cup-type strain-wave gear with a very short axial length, light weight and high stiffness for its size.
| Published maximum | CPU-M / CPU-H / CPU-S gear units | LCD |
|---|---|---|
| Peak torque | 1,840 Nm | — |
| Ratio (max) | 160:1 | 500:1 meets or exceeds |
| Backlash (lower is better) | 0 arcmin | — |
Figures are the highest published for each series and are not always measured the same way. A higher figure is not automatically a better choice: mounting, duty cycle, feedback, connectors and approvals matter too. An engineer will check the fit against your application before recommending anything.
Other strain-wave (harmonic) gear series
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