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Technical Specifications
Last Updated: 2026-09-16
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | ST-3215-C018 |
| Category | Robotics |
| Performance | |
| Torque |
12.0V417.35 oz-in30.05 kg-cm2.9 N-m |
| Speed |
12.0V0.22 sec/60°270.3 deg/s45.0 RPM |
| Running Current |
12.0V0.180 A180 mA |
| Stall Current | ≤2.7 A≤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 | Cored |
| Gears | Copper |
| Gear Ratio | 345.001:1 |
| Gear Spline/Teeth | 25 T |
| Shaft Size | 5.9 mm |
| Rotation/Support | Single Bearing |
| Backlash | 0.500° |
| Control & Signal | |
| Modulation | Digital |
| Direction | Clockwise |
| Rotational Range | 360° |
| Mechanical Limit | No Limit |
| Refresh Rate | 1000 Hz |
| Angle Sensor | Magnetic Encoder |
| Control System | Serial-PID |
| Programmable | Yes |
| Operating Modes | Position, Velocity, Step |
| Signal Voltage | 2-5V |
| Electrical & Environment | |
| Operating Voltage | 4–14 V |
| Temperature | -10–60 °C14–140 °F |
| Water Rating | None |
| Idle Current | 0.030 A30 mA |
| Connectivity | |
| Connector | Molex |
| 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 | 3.48 W |
| Power Density | 1.458 W/in³ More power-dense than 30% of 1768 Digital Standard servos |
| Torque Density | 7.5882 oz-in/g |
| Torque-to-Volume Ratio | 175.05 oz-in/in³ |
| Speed-to-Weight | 0.08190 (1/sec·g) |
| Speed-Torque Trade-off | 92.64 |
| Current-per-Torque Ratio | 0.0065 A/oz-in |
| Idle-to-Running Current Ratio | 0.167 |
| No-Load vs Stall Current Spread | 15.00 |
| Voltage Range Width | 10.0 V Wider voltage range than 99% of 1560 Digital Standard servos |
| Backlash-to-Range Ratio | 0.00139 Tighter backlash than 88% of 52 Digital Standard servos |
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Reviews (5)
Includes 5 reviews aggregated from around the web.
A retailer shows 70% from 3 reviews, and builders mention backlash and heat. Users see it as a strong value for open-source arms with the same reliability caveats as the 7.4V version.
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