Overview
The MKS X8 HBL388 Brushless Metal Gear High Torque Digital Servo Motor is designed for large-scale aircraft and heavy-duty radio control applications. This servo motor uses pulse-width control (PWM) and a Japanese-made brushless motor combined with metal-alloy gears and dual ball bearings to deliver high stall torque and reliable operation.
Key Features
- Brushless Japanese-made motor for improved efficiency and longevity
- Metal alloy gear train with 12x8mm double bearings for reduced play and extended life
- High torque output across multiple voltages (specified below)
- PWM control compatible with standard radio systems
- CNC-machined aluminum case (X8 series styling) and 8mm 25-tooth spline output
Specifications
| Model | MKS X8 HBL388 |
| Working voltage | 6.0 V – 8.4 V DC |
| Stall torque | 50 kg·cm (694.3 oz·in) @ 6.0 V; 60 kg·cm (833.2 oz·in) @ 7.4 V; 68 kg·cm (944.3 oz·in) @ 8.2 V |
| No-load speed | 0.19 s/60° @ 6.0 V; 0.16 s/60° @ 7.4 V; 0.14 s/60° @ 8.2 V |
| Stall current | 5.9 A @ 6.0 V; 7.5 A @ 7.4 V; 8.4 A @ 8.2 V |
| Working frequency | 1520 μs / 333 Hz |
| Dead band | 0.0008 ms (default) |
| Motor | Japanese-made brushless motor |
| Gear | Metal alloy gear |
| Bearing | Dual ball bearings (12 x 8 mm) |
| Wire length | 29 cm |
| Dimensions | 43 x 22 x 39.65 mm |
| Weight | 93.3 g (3.29 oz) |
| Operating temperature | -10 to +60 °C |
What’s Included
One MKS X8 HBL388 servo motor, mounting hardware and accessory pack (mounting screws, servo horn), user guide, stickers and clear plastic storage case as shown in product images. For customer service or spare parts contact: support@rcdrone.top.
Applications
Suitable for large scale airplanes, jets, helicopter cyclic systems and heavy-duty surface vehicles where high torque and robust metal gears are required.
Manuals
MKS Servo User Guide (included in the package). The user guide provides standard servo installation and safety information.
Details




Red servo with metal gears, CNC aluminum case, waterproof seals, precision stainless steel components labeled.

MKS HBL388 high torque brushless servo with red casing, orange cable, packaging, stickers, manual, and mounting hardware included.
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