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Technical Specifications
Last Updated: 2026-09-14| Identity | |
| Brand |  |
| Product Number | SR311 |
| Category | Robotics |
| Performance | |
| Torque |
6.0V
52.78 oz-in
3.80 kg-cm
0.4 N-m
4.8V
43.06 oz-in
3.10 kg-cm
0.3 N-m
Above Average
|
| Speed |
6.0V
0.12 sec/60°
500.0 deg/s
83.3 RPM
4.8V
0.14 sec/60°
428.6 deg/s
71.4 RPM
Average
|
| Physical | |
| Weight | 0.95 oz27.0 gBelow Average |
| Shape | Boxed |
| Dimensions |
L 1.232 in W 0.65 in H 1.126 in L 31.3 mm W 16.5 mm H 28.6 mm |
| Drivetrain | |
| Motor Type | Brushed |
| Gears | Metal |
| Rotation Mode | Positional |
| Rotation/Support | Single Bearing |
| Control & Signal | |
| Modulation | Analog |
| Direction | Clockwise |
| Rotational Range | 180° |
| Pulse Width | 500-2500 µs |
| Control System | PWM |
| Operating Modes | Position |
| Electrical & Environment | |
| Operating Voltage | 4.8–6 V |
| Certification | CE | RoHS |
| Connectivity | |
| Connector | JR (Universal) estimate |
| Wire Length | 200 mm7.87 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 75% of 77 Analog Mini servos at 4.8V |
| Speed | Average Faster than 45% of 77 Analog Mini servos at 4.8V |
| Weight | Below Average Lighter than 14% of 161 Analog Mini servos |
Performance Analysis
| Shaft Power | 0.57–0.81 W |
| Power Density | 0.902 W/in³ More power-dense than 57% of 158 Analog Mini servos |
| Torque Density | 1.5948 oz-in/g Stronger than 25% of 77 Analog Mini servos |
| Torque-to-Volume Ratio | 47.75 oz-in/in³ Denser torque than 38% of 77 Analog Mini servos |
| Speed-to-Weight | 0.26455 (1/sec·g) Faster than 25% of 77 Analog Mini servos |
| Speed-Torque Trade-off | 6.03 Better balanced than 63% of 77 Analog Mini servos |
| Torque Gain per Volt | 18.81%/V More voltage-responsive (torque) than 91% of 58 Analog Mini servos |
| Speed Gain per Volt | 13.88%/V More voltage-responsive (speed) than 33% of 58 Analog Mini servos |
| Voltage Range Width | 1.2 V Wider voltage range than 16% of 88 Analog Mini servos |
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Reviews (3)
Includes 3 reviews aggregated from around the web.
There are very few reviews for this servo on the web, and almost all feedback comes from owners of the Arduino Braccio robot arm, which uses it for the gripper and wrist rotation. One owner reports that an SR311 stopped working in one of their arms and says a trustworthy replacement is hard to find. Another could get only about 170 degrees of the advertised 180 degrees of wrist rotation and asked whether the servo or the software was responsible; the replies did not settle it. A third owner swapped motor positions to give the gripper a wider range of motion. The cause of these problems is unclear and may not be the servo.
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