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Technical Specifications
Last Updated: 2026-08-28
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | XQ-S4020D |
| Category | Hobby |
| Performance | |
| Torque |
6.0V
302.80 oz-in
21.80 kg-cm
2.1 N-m
4.8V
256.90 oz-in
18.50 kg-cm
1.8 N-m
Average
|
| Speed |
6.0V
0.13 sec/60°
461.5 deg/s
76.9 RPM
4.8V
0.15 sec/60°
400.0 deg/s
66.7 RPM
Average
|
| Running Current |
6.0V
0.150 A
150 mA
4.8V
0.125 A
125 mA
Above Average
|
| Stall Current | 1.185–1.42 A1185–1420 mATop 10% |
| Physical | |
| Weight | 2.03 oz57.5 gAbove Average |
| Dimensions |
L 1.583 in W 0.791 in H 1.528 in L 40.2 mm W 20.1 mm H 38.8 mm |
| Case Material | Plastic / Aluminum |
| Drivetrain | |
| Motor Type | Coreless |
| Gears | Titanium |
| Gear Spline/Teeth | 25 T |
| Rotation Mode | Positional |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Digital |
| Direction | Counterclockwise |
| Rotational Range | 110° |
| Mechanical Limit | 210° |
| Pulse Width | 800-2200 µs |
| Neutral Position | 1500 µs |
| Dead Band | 2 µs |
| Angle Sensor | Potentiometer |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 4.8–6 V |
| Power Source | 2S Li-Po |
| Temperature | -15–60 °C5–140 °F |
| Water Rating | Splashproof |
| Certification | CE |
| Idle Current | 0.009 A9 mA |
| Connectivity | |
| Connector | JR (Universal) |
| Wire Length | 300 mm11.81 in |
| 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 | Average Stronger than 59% of 1043 Digital Standard servos at 4.8V |
| Speed | Average Faster than 41% of 1041 Digital Standard servos at 4.8V |
| Weight | Above Average Lighter than 67% of 1902 Digital Standard servos |
| Running Current | Above Average Lower draw than 76% of 173 Digital Standard servos at 4.8V |
| Stall Current | Top 10% Lower draw than 93% of 539 Digital Standard servos |
Performance Analysis
| Shaft Power | 3.17–4.31 W |
| Power Density | 2.251 W/in³ More power-dense than 48% of 1759 Digital Standard servos |
| Torque Density | 4.4678 oz-in/g Stronger than 69% of 1036 Digital Standard servos |
| Torque-to-Volume Ratio | 134.27 oz-in/in³ Denser torque than 58% of 1042 Digital Standard servos |
| Speed-to-Weight | 0.11594 (1/sec·g) Faster than 51% of 1033 Digital Standard servos |
| Speed-Torque Trade-off | 38.54 Better balanced than 63% of 1031 Digital Standard servos |
| Current-per-Torque Ratio | 0.0055 A/oz-in More efficient than 97% of 315 Digital Standard servos |
| Idle-to-Running Current Ratio | 0.072 Lower idle draw than 48% of 112 Digital Standard servos |
| No-Load vs Stall Current Spread | 11.36 Narrower current spread than 69% of 132 Digital Standard servos |
| Torque Gain per Volt | 14.89%/V More voltage-responsive (torque) than 44% of 850 Digital Standard servos |
| Speed Gain per Volt | 12.81%/V More voltage-responsive (speed) than 34% of 871 Digital Standard servos |
| Voltage Range Width | 1.2 V Wider voltage range than 16% of 1539 Digital Standard servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0014 Finer dead band than 56% of 468 Digital Standard servos |
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Reviews (2)
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rc boats
May 6, 2018Application(s): rudder for rc gas boat/s
Comments: have damaged one , have had a good run with the one thats in my cat (R42)
rcmodeller324
October 8, 2016Application(s): All servos on 88" 3D aircraft.
Comments: These servos are precise and very smooth. I operate them on 6 volt and have lots of torque! High quality and great price