Planetary gearbox
maxon GPX
Configurable planetary gearheads from 4 mm to 70 mm diameter, with ceramic and ultra-performance versions for higher torque and life.
Key specifications
| Outer diameter | 4–70 mm |
|---|---|
| Rated torque (max) | 70 Nm |
| Peak torque (max) | 87.5 Nm |
| Ratio | 3.9–1,526:1 |
| Backlash (max) | 81 arcmin |
Summarised in our own words from maxon group (maxon motor ag)'s published data; series maxima, individual models vary. Last checked 2026-10-29. Source 1 · Source 2 · Source 3
Notes on this data
GPX 70 UP 2-stage: 70 Nm continuous, 87.5 Nm intermittent; GPX 22 ratios 3.9-1526 (4 stages). Other sizes may extend ratio range; not read. Backlash given in degrees: 0.5 deg (GPX 70) to 1.35 deg (GPX 22 4-stage) = 30-81 arcmin; 81 stored (converted). Sizes 4, 6, 8, 10, 12, 13, 14, 16, 19, 22, 26, 32, 37, 42, 52, 70 mm.
Specify Motion is not affiliated with maxon group (maxon motor ag). maxon and GPX 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 maxon 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.
High-rigidity Wanshsin inline planetary with three backlash classes down to super-precision, for machine tools, automation and AGVs.
| Published maximum | GPX | WSH |
|---|---|---|
| Rated torque | 70 Nm | 2,400 Nm meets or exceeds |
| Peak torque | 87.5 Nm | 7,200 Nm meets or exceeds |
| Ratio (max) | 1,526:1 | 100:1 |
| Backlash (lower is better) | 81 arcmin | 1.5 arcmin meets or exceeds |
Wanshsin inline planetary designed for high radial loads, offered in three precision classes.
| Published maximum | GPX | WTH |
|---|---|---|
| Rated torque | 70 Nm | 2,050 Nm meets or exceeds |
| Peak torque | 87.5 Nm | 6,150 Nm meets or exceeds |
| Ratio (max) | 1,526:1 | 100:1 |
| Backlash (lower is better) | 81 arcmin | 1.5 arcmin meets or exceeds |
Apex Dynamics high-precision helical planetary with a one-piece stainless planet cage and very short length; ADS adds a keyed input shaft for belt pulley or coupling drive.
| Published maximum | GPX | AD / ADR / ADS |
|---|---|---|
| Rated torque | 70 Nm | — |
| Peak torque | 87.5 Nm | — |
| Ratio (max) | 1,526:1 | — |
| Backlash (lower is better) | 81 arcmin | 1 arcmin meets or exceeds |
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 planetary gearbox series
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