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Technical Specifications
Last Updated: 2026-10-21
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | ST3215 Servo |
| Category | Robotics |
| Performance | |
| Torque |
12.0V416.62 oz-in30.00 kg-cm2.9 N-m |
| Speed |
12.0V0.22 sec/60°270.3 deg/s45.0 RPM |
| Running Current |
12.0V0.200 A200 mA |
| Stall Current | ≤2.7 A≤2700 mAAbove Average |
| Physical | |
| Weight | 2.43 oz69.0 gAverage |
| Shape | Boxed |
| Dimensions |
L 1.78 in W 0.973 in H 1.378 in L 45.2 mm W 24.7 mm H 35.0 mm |
| Case Material | Nylon / Fiberglass |
| Drivetrain | |
| Motor Type | Brushed |
| Gears | Copper / Steel |
| Gear Spline/Teeth | 25 T |
| Shaft Size | 5.9 mm |
| Rotation Mode | Multi-turn |
| Backlash | 0.500° |
| Control & Signal | |
| Modulation | Digital |
| Rotational Range | 360° |
| Mechanical Limit | No Limit |
| Angle Sensor | Magnetic Encoder |
| Control System | TTL |
| Programmable | Yes |
| Resolution | 4,096 pulse/rev |
| Operating Modes | Position, Velocity, Step |
| Electrical & Environment | |
| Operating Voltage | 6–12.6 V |
| Idle Current | 0.200 A200 mA |
| Connectivity | |
| Connector | JST |
| Baud Rate | 38.4 Kbps–1 Mbps |
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 | Average Lighter than 36% of 1880 Digital Standard servos |
| Stall Current | Above Average Lower draw than 69% of 570 Digital Standard servos |
Performance Analysis
| Torque Density | 6.0380 oz-in/g |
| Torque-to-Volume Ratio | 174.57 oz-in/in³ |
| Speed-to-Weight | 0.06528 (1/sec·g) |
| Speed-Torque Trade-off | 92.48 |
| Current-per-Torque Ratio | 0.0065 A/oz-in |
| Idle-to-Running Current Ratio | 1.000 |
| No-Load vs Stall Current Spread | 13.50 |
| Voltage Range Width | 6.6 V Wider voltage range than 98% of 1560 Digital Standard servos |
| Backlash-to-Range Ratio | 0.00139 Tighter backlash than 78% of 52 Digital Standard servos |
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Reviews (28)
Includes 28 reviews aggregated from around the web.
There are few reviews for this servo on the web. A Czech robotics hobbyist who discovered it calls it a dream drive for small robots because it offers digital control with position feedback across the full range at an affordable price. One German retailer customer rates it 4 out of 5.
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