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Technical Specifications
Last Updated: 2026-10-14| Identity | |
| Brand |  |
| Product Number | STS3215 |
| Category | Robotics |
| Performance | |
| Torque |
7.4V
271.28 oz-in
19.53 kg-cm
1.9 N-m
6.0V
229.54 oz-in
16.53 kg-cm
1.6 N-m
|
| Speed |
7.4V
0.19 sec/60°
312.5 deg/s
52.1 RPM
6.0V
0.24 sec/60°
252.1 deg/s
42.0 RPM
|
| Running Current |
7.4V
0.650 A
650 mA
6.0V
0.500 A
500 mA
|
| Stall Current | 2–2.7 A2000–2700 mAAbove Average |
| Physical | |
| Weight | 1.94 oz55.0 gAbove Average |
| Shape | Boxed |
| Dimensions |
L 1.78 in W 0.972 in H 1.378 in L 45.2 mm W 24.7 mm H 35.0 mm |
| Case Material | Plastic |
| Drivetrain | |
| Motor Type | Coreless |
| Gears | Metal |
| Gear Ratio | 345:1 |
| Gear Spline/Teeth | 25 T |
| Shaft Size | 5.9 mm |
| Rotation Mode | Continuous |
| Rotation/Support | Single Bearing |
| Backlash | 0.870° |
| Control & Signal | |
| Modulation | Digital |
| Direction | Clockwise |
| Rotational Range | 360° |
| Mechanical Limit | No Limit |
| Angle Sensor | Magnetic Encoder |
| Control System | Serial-PID |
| Programmable | Yes |
| Resolution | 4,096 pulse/rev |
| Operating Modes | Position, Velocity, Step |
| Signal Voltage | 2-5V |
| Electrical & Environment | |
| Operating Voltage | 4–14 V |
| Temperature | -20–60 °C-4–140 °F |
| Water Rating | Not Rated |
| Certification | RoHS |
| Idle Current | 0.060 A60 mA |
| Connectivity | |
| Connector | JST |
| Wire Length | 150 mm5.91 in |
| Baud Rate | 38.4 Kbps–1 Mbps |
| 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 76% of 1880 Digital Standard servos |
| Stall Current | Above Average Lower draw than 70% of 570 Digital Standard servos |
Performance Analysis
| Shaft Power | 1.78–2.61 W |
| Power Density | 1.096 W/in³ More power-dense than 21% of 1768 Digital Standard servos |
| Torque Density | 4.1735 oz-in/g |
| Torque-to-Volume Ratio | 96.28 oz-in/in³ |
| Speed-to-Weight | 0.07639 (1/sec·g) |
| Speed-Torque Trade-off | 54.63 |
| Current-per-Torque Ratio | 0.0118 A/oz-in |
| Idle-to-Running Current Ratio | 0.120 |
| No-Load vs Stall Current Spread | 5.40 |
| Voltage Range Width | 10.0 V Wider voltage range than 99% of 1560 Digital Standard servos |
| Backlash-to-Range Ratio | 0.00242 Tighter backlash than 71% of 52 Digital Standard servos |
Notes
Feetech sells the STS3215 under multiple sub-model codes (C001 for 7.4V/19kg, C018 and C047 for 12V/30kg) sharing identical mechanical housings but different metal gear materials.
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Reviews (22)
Includes 22 reviews aggregated from around the web.
Makers praise the value, the daisy-chain wiring, the position, temperature and load feedback, and the easy, well-documented setup, and it is the servo most builders of the open-source SO-100 and SO-101 arms use. Retailer ratings are generally positive but sample sizes are small, and some buyers report dead units or a frustrating first setup. Bench tests and builder reports show measurable backlash and slow-speed judder that needs PID tuning. Heat is a concern, with one test pushing a unit very hot without a thermal shutdown. Builders also report grippers or joints stalling under sustained load and ending in a stiff or dead servo, and wrong-voltage mistakes destroy units quickly.
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