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Technical Specifications
Last Updated: 2026-10-24
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | HD-R20S |
| Category | Hobby |
| Performance | |
| Torque |
8.4V
347.25 oz-in
25.00 kg-cm
2.5 N-m
7.4V
277.80 oz-in
20.00 kg-cm
2.0 N-m
6.0V
236.13 oz-in
17.00 kg-cm
1.7 N-m
Average
|
| Speed |
8.4V
0.08 sec/60°
750.0 deg/s
125.0 RPM
7.4V
0.09 sec/60°
666.7 deg/s
111.1 RPM
6.0V
0.11 sec/60°
545.5 deg/s
90.9 RPM
Above Average
|
| Physical | |
| Weight | 2.36 oz67.0 gAverage |
| Dimensions |
L 1.61 in W 0.81 in H 1.51 in L 40.9 mm W 20.6 mm H 38.4 mm |
| Case Material | Aluminum |
| Drivetrain | |
| Motor Type | Coreless |
| Gears | Titanium / Steel |
| Gear Spline/Teeth | 25 T estimate |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Digital |
| Neutral Position | 1520 µs |
| Refresh Rate | 333 Hz |
| Electrical & Environment | |
| Operating Voltage | 6–8.4 V |
| Temperature | -20–60 °C-4–140 °F |
| Connectivity | |
| Connector | JR (Universal) estimate |
| Origin | |
| Country of Origin | Hong Kong |
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 55% of 1060 Digital Standard servos at 6.0V |
| Speed | Above Average Faster than 72% of 1045 Digital Standard servos at 6.0V |
| Weight | Average Lighter than 40% of 1880 Digital Standard servos |
Performance Analysis
| Shaft Power | 3.97–8.03 W |
| Power Density | 4.076 W/in³ More power-dense than 72% of 1768 Digital Standard servos |
| Torque Density | 3.5243 oz-in/g Stronger than 52% of 1053 Digital Standard servos |
| Torque-to-Volume Ratio | 119.91 oz-in/in³ Denser torque than 52% of 1058 Digital Standard servos |
| Speed-to-Weight | 0.13569 (1/sec·g) Faster than 65% of 1038 Digital Standard servos |
| Speed-Torque Trade-off | 25.97 Better balanced than 46% of 1034 Digital Standard servos |
| Torque Gain per Volt | 19.61%/V More voltage-responsive (torque) than 76% of 873 Digital Standard servos |
| Speed Gain per Volt | 15.62%/V More voltage-responsive (speed) than 50% of 874 Digital Standard servos |
| Voltage Range Width | 2.4 V Wider voltage range than 54% of 1560 Digital Standard servos |
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