®Technical guide
R, F, K and S Geared Motors | Structure and Application Differences
Author: HUIGUANG × CHENGFA Transmission Technical Team · Updated: 2026-08-12
The main differences are gear arrangement, input/output shaft relationship and installation layout. R series suits coaxial or near-coaxial drives; F series suits parallel-shaft layouts; K series provides efficient right-angle bevel-helical transmission; and S series offers a compact right-angle helical-worm arrangement.
| Series | Shaft layout | Typical starting point | Critical inputs |
| R | coaxial/near coaxial | conveyors, mixers, general continuous drives | torque, mounting, service duty |
| F | parallel shaft | flat layouts and shaft-mounted drives | shaft load, torque arm, space |
| K | right angle | conveyors and right-angle machinery drives | rotation, shock, shaft load |
| S | right angle | compact small/medium-power machinery | efficiency, heat, starts, ambient |
Equal motor power does not make the four series interchangeable. Output speed and torque, operating hours, start frequency, shock, radial and axial loads, mounting position and heat dissipation must also be checked. For replacement work, verify centre height, feet, flange and shaft dimensions.
Send the application, power, input speed, required output speed, load, duty and installation drawing to Tinyuen at sales@chinfar.com.