MKS HBL388 X8 Brushless Titanium Gear High Voltage Digital Servo
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The MKS HBL388 is a brushless titanium gear high-voltage digital servo featuring the X8 25-tooth spline standard. Running on 5.0–8.4V, it delivers up to 944.3 oz/in (68 kg/cm) at 8.4V with a 0.14 sec/60° transit speed — delivering exceptional torque and speed for demanding 1/8 scale surface, large-scale aircraft, and high-performance RC applications.
Powered by a Japanese-made brushless motor, the HBL388 eliminates brush wear for longer service life and more consistent performance over time. Metal alloy gears with indirect-drive potentiometer feedback provide precise positioning and durability under sustained high-load use. Double 12x8mm bearings ensure smooth, rigid output shaft support.
Key Features
- Japanese-made brushless motor for extended service life and consistent performance
- Metal alloy gears for maximum torque transfer and durability
- 944.3 oz/in (68 kg/cm) stall torque at 8.4V
- 0.14 sec/60° transit speed at 8.4V
- 5.0–8.4V high-voltage operating range
- X8 25-tooth 8mm spline output
- Double 12x8mm bearings for rigid output shaft support
- Indirect drive potentiometer for accurate position feedback
- 43 x 22 x 39.65mm, 93.3g
Specifications
| Part Number | HBL388 | |
| Spline | X8 — 8mm 25-tooth | |
| Operating Voltage | 5.0 – 8.4V DC | |
| Stall Torque (6V) | 50 kg/cm — 694.3 oz/in | |
| Stall Torque (7.4V) | 60 kg/cm — 833.2 oz/in | |
| Stall Torque (8.4V) | 68 kg/cm — 944.3 oz/in | |
| Speed (6V) | 0.19 sec/60° | |
| Speed (7.4V) | 0.16 sec/60° | |
| Speed (8.4V) | 0.14 sec/60° | |
| Motor Type | Japanese-made Brushless Motor | |
| Gear Type | Metal Alloy Gear | |
| Bearing Type | Double 12x8mm Bearings | |
| Control System | +Pulse Width Control (PWM) | |
| Working Frequency | 1520μs / 333Hz | |
| Dead Band | 0.0008ms (default) | |
| Connector Wire Length | 29cm | |
| Dimensions | 43 x 22 x 39.65mm | |
| Weight | 93.3g (3.29 oz) | |
| Operating Temp Range | -10°C to +60°C | |
Compatibility
Suitable for 1/8 scale surface RC vehicles, large-scale aircraft, and high-performance applications requiring a high-voltage brushless servo with X8 25-tooth spline output. Verify receiver/ESC BEC voltage output and servo bay dimensions before purchasing.