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Technical Specifications
Last Updated: 2026-10-10
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | RS-420 |
| Category | Robotics |
| Discontinued | Yes |
| Performance | |
| Torque |
7.2V
302.80 oz-in
21.80 kg-cm
2.1 N-m
6.0V
256.90 oz-in
18.50 kg-cm
1.8 N-m
|
| Speed |
7.2V
0.13 sec/60°
461.5 deg/s
76.9 RPM
6.0V
0.15 sec/60°
400.0 deg/s
66.7 RPM
|
| Running Current |
6.0V
0.210 A
210 mA
4.8V
0.180 A
180 mA
Above Average
|
| Stall Current | 2.2–2.5 A2200–2500 mAAbove Average |
| Physical | |
| Weight | 2.03 oz57.5 gAbove Average |
| Shape | Boxed |
| 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 | 180° |
| Pulse Width | 500-2500 µs |
| Neutral Position | 1500 µs |
| Dead Band | 2 µs |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 4.8–6 V |
| Temperature | -15–60 °C5–140 °F |
| Water Rating | Splashproof |
| Idle Current | 5.000 A5,000 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
| Weight | Above Average Lighter than 68% of 1902 Digital Standard servos |
| Running Current | Above Average Lower draw than 67% of 173 Digital Standard servos at 4.8V |
| Stall Current | Above Average Lower draw than 79% 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 |
| Torque-to-Volume Ratio | 134.27 oz-in/in³ |
| Speed-to-Weight | 0.11594 (1/sec·g) |
| Speed-Torque Trade-off | 38.54 |
| Current-per-Torque Ratio | 0.0097 A/oz-in |
| Idle-to-Running Current Ratio | 27.778 Lower idle draw than 5% of 112 Digital Standard servos |
| No-Load vs Stall Current Spread | 13.89 Narrower current spread than 63% of 132 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 | 0.0010 Finer dead band than 84% of 468 Digital Standard servos |
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