Overview
The MKS X8 HBL3850 Brushless Metal Gear High Torque Servo Motor is a digital servo motor designed for large-scale model use — suitable for large scale airplanes, jets, helicopter cyclic controls and surface vehicles. The unit uses pulse width control (PWM) and a Japanese-made brushless motor with metal alloy gears for high stall torque and durability.
Key Features
- PWM (Pulse Width Modulation) control
- Japanese high-quality brushless motor
- Metal alloy gears
- 25T splined output, 8 mm bore
- Double/ball bearings (12 x 8 mm / 2× ball bearings)
- High stall torque across multiple supply voltages
Specifications
| Model | MKS X8 HBL3850 |
| Category | Brushless metal-gear digital servo motor |
| Control | PWM (Pulse Width Modulation) |
| Motor | Japanese-made brushless motor |
| Gear | Metal alloy gear |
| Output | 25T splined horn / 8 mm bore |
| Working voltage | 6.0 - 8.4 V DC |
| Stall torque | 42 kg·cm / 583.2 oz·in @ 6.0 V; 51 kg·cm / 708.2 oz·in @ 7.4 V; 57 kg·cm / 791.5 oz·in @ 8.2 V |
| No-load speed (sec/60°) | 0.142 s @ 6.0 V; 0.115 s @ 7.4 V; 0.104 s @ 8.2 V |
| Stall / operating current | 5.8 A @ 6.0 V; 7.4 A @ 7.4 V; 8.2 A @ 8.2 V |
| Working frequency | 1520 μs / 333 Hz |
| Dead band | 0.0008 ms (default) |
| Bearing | 12 x 8 mm double bearings (2× ball bearing) |
| Dimensions (body) | 40 x 20 x 38.5 mm |
| Weight | 74 g (2.61 oz) |
| Operating temperature | -10 to +60 °C |
What's Included
- 1 × MKS X8 HBL3850 servo
- Mounting hardware (metal flange/horn, screws, rivets and rubber supports as shown)
For customer service contact support@rcdrone.top
Applications
- Large-scale fixed-wing aircraft and jets
- Helicopter cyclic controls
- High-force surface control surfaces on scale models
Details




MKS X8 HBL3850 ultra torque brushless motor servo, high quality, 74g weight, 6.0V, 42-57 kg-cm torque, 0.104-0.142 sec/60° speed, red and silver design, packaged in clear box.
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