Overview
The Flashhobby CLS3850MED is a programmable digital servo (CLS servo) designed for high-torque applications up to 8.4V. It uses a coreless motor and a 14-bit magnetic encoder, supports multiple control modes (Sanwa SSR/SUR, Flysky NB4 SFR, Futaba SR), and features an IP67-rated water resistant and waterproof case.
Key Features
- Programmable PWM digital amplifier
- 32-bit MCU with 14-bit magnetic encoder
- Wide operating voltage: DC 6.0~8.4V
- Steel gears; high precision gear train
- Dual ball bearing supported output shaft (2BB)
- 25-tooth output spline
- Diamond cut aluminum heat sink shell; full aluminum CNC case (AL6061 stated)
- Water resistant and waterproof case: IP67
- Compatible refresh rate: 50Hz~1000Hz
Programmable Functions
- End point adjustments
- Direction
- Fail safe
- Dead band
- Speed (slower)
- Soft start rate
- Overload protection
- Data save / load
- Program reset
Specifications
| Model | CLS3850MED |
|---|---|
| Control system | PWM control (1500usec in the central point) |
| Operating voltage range | DC 6.0~8.4V |
| Operating speed | 0.15sec/60° @ 6.0V; 0.12sec/60° @ 7.4V; 0.11sec/60° @ 8.4V |
| Stall / standing torque | 38.0kg-cm / 528 oz-in @ 6.0V; 45.0kg-cm / 625 oz-in @ 7.4V; 50.0kg-cm / 694 oz-in @ 8.4V |
| Running current | 3400mA @ 6.0V; 4000mA @ 7.4V; 4800mA @ 8.4V |
| Motor type | Coreless |
| Signal type | Digital control |
| Angle sensor | 14-bit magnetic encoder |
| Refresh rate | Compatible 50Hz~1000Hz |
| Pulse width | 500 to 2500 uSec |
| Dead band width | 2uSec |
| Operation temperature range | -20°C to +70°C |
| Operation travel | 180° ± 5° |
| Programmable angle | Yes |
| Direction | CW |
| Driver type | Mos Drive |
| Ball bearing | 2BB |
| Gear | Steel gears |
| Waterproof level | IP67 |
| Case material | Full aluminum CNC; CNC AL6061 aluminum case stated |
| Output spline | 25-tooth |
| Dimensions | 40 x 20 x 38mm |
| Weight | 80g; 78.8g (without servo horn) stated |
| Connector wire length | 22AWG 260mm JR; 300MM JR plug stated |
| Wire info | Black: Negative; Black: Positive; White: S Single |
| Service life (no load) | > one million times without load |
| Mode compatible | Sanwa SSR/SUR; Flysky NB4 SFR; Futaba SR |
What’s Included
- Flashhobby CLS3850MED servo
- Servo horns / arms and mounting hardware set
For installation or control-mode compatibility questions, contact support@rcdrone.top or visit https://rcdrone.top/.
Details

The Flashhobby CLS3850MED coreless servo features a compact black metal housing with a 50KG marking for high-torque RC setups.

Flashhobby CLS3850MED coreless servo features an IP67 water-resistant, waterproof case and a 50kg rating on the housing.

Flash Hobby CLS3850MED coreless servo is labeled 50KG at 8.4V with an IP67-rated, diamond-cut aluminum heat-sink case.

The Flashhobby CLS3850MED servo uses a 25-tooth output spline and comes with servo horns, screws, and bushings for installation.

Flashhobby CLS3850MED digital servo runs on DC 6.0–8.4V, is rated IP67, and measures 40×20×38mm (80g).
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