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Technical Specifications
Last Updated: 2026-10-24
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | A20-3813 |
| Category | Hobby |
| Performance | |
| Torque |
8.4V
596.84 oz-in
42.98 kg-cm
4.2 N-m
7.4V
527.44 oz-in
37.98 kg-cm
3.7 N-m
6.0V
416.40 oz-in
29.98 kg-cm
2.9 N-m
Above Average
|
| Speed |
8.4V
0.12 sec/60°
500.0 deg/s
83.3 RPM
7.4V
0.13 sec/60°
461.5 deg/s
76.9 RPM
6.0V
0.15 sec/60°
400.0 deg/s
66.7 RPM
Average
|
| Physical | |
| Weight | 2.54 oz72.0 gBelow Average |
| Dimensions |
L 1.595 in W 0.787 in H 1.496 in L 40.5 mm W 20.0 mm H 38.0 mm |
| Case Material | Aluminum |
| Drivetrain | |
| Motor Type | Brushless |
| Gears | Copper / Steel |
| Gear Spline/Teeth | 25 T |
| Rotation Mode | Positional |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Digital |
| Rotational Range | 100° |
| Pulse Cycle | 3 ms |
| Pulse Width | 900-2100 µs |
| Neutral Position | 1500 µs |
| Refresh Rate | 333 Hz |
| Angle Sensor | Potentiometer |
| Control System | PWM |
| Programmable | Yes |
| Signal Voltage | 3.3–5V |
| Electrical & Environment | |
| Operating Voltage | 6–8.4 V |
| Temperature | -10–55 °C14–131 °F |
| Connectivity | |
| Connector | JR (Universal) estimate |
| Origin | |
| Country of Origin | China |
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 | Above Average Stronger than 86% of 1060 Digital Standard servos at 6.0V |
| Speed | Average Faster than 42% of 1045 Digital Standard servos at 6.0V |
| Weight | Below Average Lighter than 29% of 1880 Digital Standard servos |
Performance Analysis
| Shaft Power | 5.13–9.20 W |
| Power Density | 4.896 W/in³ More power-dense than 78% of 1768 Digital Standard servos |
| Torque Density | 5.7833 oz-in/g Stronger than 86% of 1053 Digital Standard servos |
| Torque-to-Volume Ratio | 221.68 oz-in/in³ Denser torque than 88% of 1058 Digital Standard servos |
| Speed-to-Weight | 0.09259 (1/sec·g) Faster than 28% of 1038 Digital Standard servos |
| Speed-Torque Trade-off | 62.46 Better balanced than 86% of 1034 Digital Standard servos |
| Torque Gain per Volt | 18.06%/V More voltage-responsive (torque) than 70% of 873 Digital Standard servos |
| Speed Gain per Volt | 10.42%/V More voltage-responsive (speed) than 20% of 874 Digital Standard servos |
| Voltage Range Width | 2.4 V Wider voltage range than 59% of 1560 Digital Standard servos |
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