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Technical Specifications
Last Updated: 2026-07-10
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | ES9251 |
| Category | Hobby |
| Performance | |
| Torque |
4.5V3.75 oz-in0.27 kg-cm0.0 N-mBelow Average |
| Speed |
4.5V0.08 sec/60°750.0 deg/s125.0 RPMAbove Average |
| Physical | |
| Weight | 0.14 oz4.0 gAverage |
| Dimensions |
L 0.71 in W 0.311 in H 0.661 in L 18.0 mm W 7.9 mm H 16.8 mm |
| Case Material | Plastic |
| Drivetrain | |
| Gears | Plastic |
| Control & Signal | |
| Modulation | Digital |
| Direction | Counterclockwise |
| Pulse Width | 1500-1900 µs |
| Neutral Position | 1500 µs |
| Electrical & Environment | |
| Operating Voltage | 4.5–6 V |
| Connectivity | |
| Connector | JR |
| 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 | Below Average Stronger than 21% of 29 Nano servos at 4.5V |
| Speed | Above Average Faster than 71% of 29 Nano servos at 4.5V |
| Weight | Average Lighter than 43% of 41 Digital Nano servos |
Performance Analysis
| Shaft Power | 0.09 W |
| Power Density | 0.594 W/in³ More power-dense than 26% of 35 Digital Nano servos |
| Torque Density | 0.9375 oz-in/g Stronger than 0% of 31 EMAX servos |
| Torque-to-Volume Ratio | 25.69 oz-in/in³ Denser torque than 0% of 31 EMAX servos |
| Speed-to-Weight | 3.12500 (1/sec·g) 1st-highest speed-to-weight of 31 EMAX servos |
| Speed-Torque Trade-off | 0.30 Better balanced than 0% of 31 EMAX servos |
| Voltage Range Width | 1.5 V Wider voltage range than 52% of 32 Digital Nano servos |
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