KST X20-4208 High-Performance Brushless Servo
The KST X20-4208 is designed for pilots who demand exceptional power, precision, and long-term reliability. Equipped with a 4-pole brushless motor, it delivers outstanding torque while maintaining extremely fast response times, making it an excellent choice for demanding applications, including high-performance 3D aerobatic aircraft.
Its hardened steel HLS gearbox, supported by six precision ball bearings, ensures maximum durability and minimal gear play even after countless flights. The result is a servo that continues to provide accurate centering and consistent performance in the most demanding conditions.
At Aerobertics, we particularly appreciate the X20-4208 for its combination of impressive torque, speed, and reliability. Whether you're building a competition-level aerobatic model or a large-scale sport aircraft, this servo delivers the confidence and precision experienced pilots expect.
Technical Specifications
- Operating Voltage: 6.0 – 8.4 V
Torque
- 38.0 kg·cm @ 6.0 V
- 42.0 kg·cm @ 7.4 V
- 46.0 kg·cm @ 8.4 V
Speed
- 0.10 sec/60° @ 6.0 V
- 0.08 sec/60° @ 7.4 V
- 0.07 sec/60° @ 8.4 V
Stall Current
- 7.6 A @ 6.0 V
- 10.0 A @ 7.4 V
- 12.6 A @ 8.4 V
Dimensions
Weight
Features
- Powerful 4-pole brushless motor
- Hardened steel HLS gear train
- 6 precision ball bearings (6BB)
- Digital electronics
- Standard-size servo
- 25T-6 output spline
- Potentiometer position sensor
- Programmable Soft Start
- Fully programmable using KST Tool 3 and KST Tool 5
- Operating frequency: 1520 μs / 333 Hz (1000–2000 μs)
- Not waterproof
Note: Always refer to your aircraft manufacturer's servo specifications to ensure compatibility and suitability for your application.
