BLS825 V8.0 Brushless HV Metal Case Servo 35kg.cm 0.11sec/60° for 550-700 Class Helicopters
KST BLS825 Brushless HV Servo
The KST BLS825 is a high-performance brushless servo developed for surface RC models where precise and reliable control is essential. Its powerful brushless motor delivers responsive performance, while the robust full-metal geartrain provides excellent durability under demanding conditions.
Designed with high return-to-center accuracy and a backlash-free metal geartrain, the BLS825 helps maintain precise and consistent control throughout operation. This makes it particularly well suited for scale models and aerobatic RC applications where accurate steering and control response matter.
With its combination of brushless power, precise positioning, and rugged full-metal construction, the BLS825 is a dependable choice for demanding surface RC models.

Features
- Hardened Steel Gears
- Extreme Torque and Excellent Speed
- CNC Aluminium Case
- Brushless DC Motor
- Two Ball Bearings
- Ideal for 550-700 Class Helicopters
Specification
| Parameter | Value |
| Item | BLS825 Brushless Servo |
| Operation Voltage (rated) | DC7.4V |
| Operating Voltage | DC6.0V-8.4V |
| Size | 40.50 × 20 × 37mm |
| Torque | 25Kg.cm@6.0V / 30Kg.cm@7.4V / 35Kg.cm@8.4V |
| Speed | 0.15sec/60°@6.0V / 0.13sec/60°@7.4V / 0.11sec/60°@8.4V |
| Travel Angle | ±50° = 100° Total |
| Working Frequency | 1520us/333Hz |
| Motor | Brushless |
| Ball Bearing | 2BB |
| Weight | 70g |
Package Contents
- 1 * BLS825 Brushless servo
- 1 Pack of Accessories
