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Technical Specifications
Last Updated: 2026-10-23
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | HK939MG |
| Category | Hobby |
| Performance | |
| Torque |
6.0V
37.48 oz-in
2.70 kg-cm
0.3 N-m
4.8V
34.70 oz-in
2.50 kg-cm
0.2 N-m
Top 10%
|
| Speed |
6.0V
0.13 sec/60°
461.5 deg/s
76.9 RPM
4.8V
0.14 sec/60°
428.6 deg/s
71.4 RPM
Below Average
|
| Physical | |
| Weight | 0.44 oz12.5 gBelow Average |
| Dimensions |
L 0.886 in W 0.453 in H 0.969 in L 22.5 mm W 11.5 mm H 24.6 mm |
| Drivetrain | |
| Motor Type | Coreless |
| Gears | Metal |
| Gear Spline/Teeth | 21 T |
| Rotation Mode | Positional |
| Rotation/Support | Single Bearing |
| Control & Signal | |
| Modulation | Analog |
| Rotational Range | 80° |
| Dead Band | 5 µs |
| Angle Sensor | Potentiometer |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 4.8–6 V |
| Temperature | -20–60 °C-4–140 °F |
| Connectivity | |
| Connector | JR (Universal) estimate |
| Wire Length | 215 mm8.46 in |
Disclaimer: Most data is sourced from the manufacturer. Some data is sourced from our loyal community and with the help of AI. We aim for accuracy but are not responsible for inaccurate information.
Class Comparison
| Torque | Top 10% Stronger than 96% of 160 Analog Micro servos at 4.8V |
| Speed | Below Average Faster than 23% of 160 Analog Micro servos at 4.8V |
| Weight | Below Average Lighter than 18% of 336 Analog Micro servos |
Performance Analysis
| Shaft Power | 0.46–0.53 W |
| Power Density | 1.372 W/in³ More power-dense than 88% of 322 Analog Micro servos |
| Torque Density | 2.7760 oz-in/g Stronger than 90% of 160 Analog Micro servos |
| Torque-to-Volume Ratio | 89.33 oz-in/in³ 3rd-highest torque-to-volume ratio of 160 Analog Micro servos |
| Speed-to-Weight | 0.57143 (1/sec·g) Faster than 19% of 160 Analog Micro servos |
| Speed-Torque Trade-off | 4.86 Better balanced than 93% of 159 Analog Micro servos |
| Torque Gain per Volt | 6.68%/V More voltage-responsive (torque) than 6% of 101 Analog Micro servos |
| Speed Gain per Volt | 6.40%/V More voltage-responsive (speed) than 3% of 101 Analog Micro servos |
| Voltage Range Width | 1.2 V Wider voltage range than 29% of 174 Analog Micro servos |
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Reviews (2)
Includes 2 reviews aggregated from around the web.
There are very few reviews for this servo on the web. A Flite Test forum user says the servo has short arms for 3D flying and poor centering that causes control surface problems.
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