SEW Eurodrive KA, SA, RF (gearmotors with DR.. motor)
SEW-EURODRIVE gearmotors: K (helical-bevel), S (worm), R (helical) and F (parallel-shaft) codes, with the KA, SA, RF variants and DR.. / DRN motor.
In the code of a SEW-EURODRIVE gearmotor, the first letter indicates the gear unit type: R for helical gear units, F for parallel-shaft helical gear units, K for helical-bevel gear units, S for worm gear units (with a helical input stage) and W for SPIROPLAN® gear units. The letters that follow describe the mounting variant: for example “KA” is the helical-bevel gearmotor with hollow shaft, “SA” is the worm gearmotor with hollow shaft, and “RF” is the helical gearmotor with B5 flange.
The full code also includes the motor, for example “K107R77 DRN100LS4/TF”: the K107R77 gear unit (double gearmotor: helical-bevel gear unit K, size 107, combined with helical gear unit R, size 77) and the DRN100LS4 motor with TF temperature sensor. For a quotation request please send the full code from the nameplate, the output speed or the gear ratio and the mounting position; we confirm the code and the availability in the quotation.
Models and codes
| Code | Note |
|---|---|
| KA19 DR.. | helical-bevel gearmotor with hollow shaft; sizes K..19 and K..29 also have the variants KA19B (with feet) and KAF19 (with B5 flange). |
| KAF19 DR.. | helical-bevel gearmotor with hollow shaft and B5 flange. |
| SA..DR.. | worm gearmotor with hollow shaft. |
| SAF..DR.. | worm gearmotor with B5 flange and hollow shaft. |
| RF..DR.. | helical gearmotor with B5 flange. |
| R..DR.. | helical gearmotor with feet; the R..F DR.. variant has feet and B5 flange. |
| K107R77 DRN100LS4/TF | example of a full code from the manufacturer's document, with DRN motor and TF temperature sensor. |
Key specifications
| Output torque, helical gear units R | 50–20.000 Nm |
|---|---|
| Output torque, parallel-shaft gear units F | 130–20.000 Nm |
| Output torque, helical-bevel gear units K | 80–53.000 Nm |
| Output torque, worm gear units S | 92–4.000 (S..7p: 105–4.300) Nm |
| Gear ratios, gear units R | from i = 1.30 to i = 289.74 (in compound, up to i = 27,001) |
| Gear unit types | R, F, K, S, W (SPIROPLAN®) |
The document “DRN.. gearmotors (IE3)” is edition 02/2026 from the manufacturer's documentation server; it does not mention the withdrawal of the R, F, K, S and W series.
Frequently asked questions
What do KA, SA and RF mean?
The first letters show the gear unit type (K helical-bevel, S worm, R helical), and the following letters the mounting variant: A = hollow shaft, F = B5 flange. Thus KA is helical-bevel with hollow shaft, SA is worm with hollow shaft, and RF is helical with B5 flange. The manufacturer's document lists the variants for each type.
How do I read a full code, for example K107R77 DRN100LS4/TF?
K107R77 is the gear unit of a double gearmotor (K, size 107, combined with R, size 77), DRN100LS4 is the motor (DR series, product line N, size 100, rotor length LS, 4 poles), and /TF is the temperature sensor. The full code from the nameplate allows us to confirm the exact variant.
What data should I send for a quotation?
The full code from the nameplate, the output speed or the gear ratio, the mounting position, the voltage and the frequency. To order, the lead time is usually 1–4 weeks; the availability and the exact lead time are confirmed in the quotation.
Other SEW Eurodrive series
The description explains the code structure and the torque ranges; the selection data for each gear ratio and size (selection tables, mounting positions, radial loads) are established from the manufacturer's documentation, against the exact code.
Updated: 2026-11-12