Planetary gearbox
WITTENSTEIN alpha alpha SP+
alpha Advanced Line low-backlash coaxial planetary servo gearbox with shaft output, in standard and high-speed versions.
Key specifications
| Peak torque (max) | 5,700 Nm |
|---|---|
| Speed (max) | 9,000 rpm |
| Ratio | 3–100:1 |
| Backlash (max) | 3 arcmin |
Summarised in our own words from WITTENSTEIN SE's published data; series maxima, individual models vary. Last checked 2026-10-29. Source 1 · Source 2
Notes on this data
Max torque T2a 48-5700 Nm stored as torque_Nm_peak_max. Backlash <=3 arcmin standard, <=1 reduced. HIGH SPEED (MC) version: 68-3600 Nm, 7000 rpm, <=4/<=2 arcmin. Product grid lists backlash range <=1-4 arcmin. 7 sizes.
Specify Motion is not affiliated with WITTENSTEIN SE. WITTENSTEIN alpha and alpha SP+ 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 WITTENSTEIN alpha 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 | alpha SP+ | WSH |
|---|---|---|
| Rated torque | — | 2,400 Nm |
| Peak torque | 5,700 Nm | 7,200 Nm meets or exceeds |
| Ratio (max) | 100:1 | 100:1 meets or exceeds |
| Backlash (lower is better) | 3 arcmin | 1.5 arcmin meets or exceeds |
Wanshsin inline planetary designed for high radial loads, offered in three precision classes.
| Published maximum | alpha SP+ | WTH |
|---|---|---|
| Rated torque | — | 2,050 Nm |
| Peak torque | 5,700 Nm | 6,150 Nm meets or exceeds |
| Ratio (max) | 100:1 | 100:1 meets or exceeds |
| Backlash (lower is better) | 3 arcmin | 1.5 arcmin meets or exceeds |
Apex Dynamics economy planetary family (PE, PG, PA, PS, PN, PD, PL sub-series) for high-volume automation; standard backlash, inline or right-angle.
| Published maximum | alpha SP+ | P-II / P-IIR |
|---|---|---|
| Rated torque | — | 459 Nm |
| Peak torque | 5,700 Nm | — |
| Ratio (max) | 100:1 | 1,000:1 meets or exceeds |
| Backlash (lower is better) | 3 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 planetary gearbox series
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