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Technical Specifications
Last Updated: 2026-09-13
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | SR431 |
| Category | Robotics |
| Performance | |
| Torque |
6.0V
201.40 oz-in
14.50 kg-cm
1.4 N-m
4.8V
169.50 oz-in
12.21 kg-cm
1.2 N-m
Above Average
|
| Speed |
6.0V
0.18 sec/60°
333.3 deg/s
55.6 RPM
4.8V
0.20 sec/60°
300.0 deg/s
50.0 RPM
Below Average
|
| Physical | |
| Weight | 2.19 oz62.0 gBottom 10% |
| Shape | Boxed |
| Dimensions |
L 1.654 in W 0.807 in H 1.555 in L 42.0 mm W 20.5 mm H 39.5 mm |
| Drivetrain | |
| Gears | Metal |
| Gear Spline/Teeth | 25 T |
| Rotation Mode | Standard |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Analog |
| Rotational Range | 180° |
| Pulse Width | 500-2500 µs |
| Neutral Position | 1500 µs |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 4.8–6 V |
| Connectivity | |
| Connector | Futaba J |
| Wire Length | 270 mm10.63 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 | Above Average Stronger than 89% of 198 Analog Standard servos at 4.8V |
| Speed | Below Average Faster than 30% of 195 Analog Standard servos at 4.8V |
| Weight | Bottom 10% Lighter than 9% of 447 Analog Standard servos |
Performance Analysis
| Shaft Power | 1.57–2.07 W |
| Power Density | 0.997 W/in³ More power-dense than 79% of 432 Analog Standard servos |
| Torque Density | 2.7339 oz-in/g Stronger than 83% of 198 Analog Standard servos |
| Torque-to-Volume Ratio | 81.66 oz-in/in³ Denser torque than 86% of 198 Analog Standard servos |
| Speed-to-Weight | 0.08065 (1/sec·g) Faster than 13% of 195 Analog Standard servos |
| Speed-Torque Trade-off | 33.90 Better balanced than 90% of 195 Analog Standard servos |
| Torque Gain per Volt | 15.68%/V More voltage-responsive (torque) than 53% of 156 Analog Standard servos |
| Speed Gain per Volt | 9.25%/V More voltage-responsive (speed) than 10% of 156 Analog Standard servos |
| Voltage Range Width | 1.2 V Wider voltage range than 38% of 239 Analog Standard servos |
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Reviews (7)
Includes 7 reviews aggregated from around the web.
There are very few independent reviews for this servo on the web. The Braccio arm kit that uses it rates only about 3/5 on Amazon, and users report weak shoulder performance and servos giving out under load. Owners looking for replacements say the original is expensive or hard to find. It is seen as adequate for the light-duty arm it was designed for.
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