S series helical-worm gear units

The strength of our helical-worm gear units lies in their simple mechanical design, making them more efficient than plain worm gear units. S series gear units also run smoothly in operation.

S series helical-worm gear units – simple design, exceptionally smooth-running

S series helical-worm gear units
Gearmotor with S series helical-worm gear unit from SEW‑EURODRIVE
Gearmotor with S series helical-worm gear unit from SEW‑EURODRIVE

While their cost-effectiveness is due to their simple design, custom coordination options for torque and speed ensure our helical-worm gear units are compact for ease of installation. Use S series helical-worm gear units as a cost-effective solution for meeting basic requirements in your machine or plant applications.

Adding in a helical gear stage means that significantly higher efficiency can be achieved than when using plain worm gear units. The linear power transmission makes these helical-worm gear units exceptionally smooth-running and low-noise. Why? Power is transmitted to the input shaft via the worm shaft and worm gear in a process that reduces torque impulses and facilitates low noise levels.

The torque range extends from 92 to 4000 Nm. For the new S..7p it is 105 Nm to 4300 Nm.

S..7p – helical-worm gear units with enhanced torque

The new S..7p series
The new S..7p series
The new S..7p series

Our new S..7power series offers even higher torque for all seven sizes, which ensures you can benefit from a higher power density. Torque on the S..7p series is up to 65 % higher than on standard S..7 helical-worm gear units.

  • Lubrication

Besides lubricating the gearing, gear oils also play a significant role in dissipating heat in gear units. Our new lubricant SEW GearOil Poly increases the performance of worm gear units by reducing friction in the gear teeth in particular. As a result, the helical-worm gear units can be pushed to a higher torque. SEW GearOil Poly forms a highly effective lubrication film, which increases the service life of both the lubricant itself and wear parts such as sealing rings and bearings. SEW GearOil Poly also improves the efficiency of the helical-worm gear units.

  • Efficiency

The way power and speed are transmitted in helical-worm gearing generates a high level of sliding friction between the worm and worm gear. Using SEW GearOil Poly ensures outstanding lubrication and optimum heat dissipation at every operating point, which fundamentally enhances efficiency. As a result, it has been possible to increase the efficiency of S..7p helical-worm gear units by up to 13 percentage points. This effect is particularly noticeable on the large gear ratios and is hugely beneficial. This enhanced efficiency immediately gives you a higher usable output torque for the same motor power. If the higher output torque is not taken off, consumption is reduced at the same speed and you save energy and benefit from reduced energy costs.

  • More power or more reserves

The increased torques mean that, in the best-case scenarios, you can select the next size down, as you can now take off higher torques in a smaller space or, if you cannot vary the gear unit size, you have greater safety/reserves in your drive.

Only half the solution without a motor?

helical-worm gear units

Then use our modular system and combine the helical-worm gear units of the S series or the new S..7p series with an AC motor to form an S..DR.. helical-worm gearmotor or with a servomotor to form an S..CMP helical-worm servo gearmotor of your choice. Or simply choose the separate AC motor that meets your requirements or servomotor.

Configure your customized product

  • Detailed information about your individual product
  • CAD data and documentation for your configuration
  • Option to directly request a quotation
Configure product now

Your benefits

  • Space-saving installation

    thanks to custom coordination options for torque and speed in all seven sizes.
  • High efficiency

    thanks to the simple design of the helical-worm gear unit.
  • Low-noise operation

    because the linear power transmission attenuates torque impulses on the drive shaft.


  • Much greater efficiency than plain worm gear units thanks to helical-worm combinations
  • Very low-noise operation
  • Available variants:
    • Foot- or flange-mounted
    • B5 or B14 flange-mounted
    • Solid shaft or hollow shaft
    • Hollow shaft with keyed connection, shrink disk, splined hollow shaft, or TorqLOC®

Technical data

S series / sizes 37 / 47 / 57 / 67 / 77 / 87 / 97

Close table
Gear unit ratio i 3.97 – 288.00
Gear unit ratio – compound gear units i 110 – 33 818
Max. output torque Nm 92 – 4000
Motor power range (Mounting via AM motor adapter) kW 0.12 – 30
We have stored a table for you here.

Areas of applications

  • Stage drives
  • Adjustment drives
  • Presses
  • Rotary tables
  • Corner transfer units

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