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Technical Specifications
Last Updated: 2026-10-09
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | 902-0005-001 |
| Category | Robotics |
| Discontinued | Yes |
| Performance | |
| Torque |
12.0V254.88 oz-in18.35 kg-cm1.8 N-m |
| Speed |
12.0V0.10 sec/60°582.5 deg/s97.1 RPM |
| Running Current |
12.0V2.200 A2,200 mA |
| Stall Current | 1500–2.2 A1500000–2200 mAAbove Average |
| Physical | |
| Weight | 1.97 oz55.9 gTop 10% |
| Shape | Boxed |
| Dimensions |
L 1.969 in W 1.26 in H 1.575 in L 50.0 mm W 32.0 mm H 40.0 mm |
| Case Material | Plastic |
| Drivetrain | |
| Motor Type | Coreless |
| Gears | Plastic |
| Gear Ratio | 254:1 |
| Shaft Size | 6.0 mm |
| Rotation/Support | Single Bearing |
| Control & Signal | |
| Modulation | Digital |
| Direction | Bidirectional |
| Rotational Range | 300° |
| Mechanical Limit | 300° |
| Neutral Position | 512 µs |
| Dead Band | 0.29 µs |
| Refresh Rate | 500 Hz |
| Angle Sensor | Potentiometer |
| Control System | TTL |
| Programmable | Yes |
| Resolution | 1,024 pulse/rev |
| Operating Modes | Position (Joint Mode), Velocity (Wheel Mode) |
| Signal Voltage | 5V |
| Electrical & Environment | |
| Operating Voltage | 9–12 V |
| Temperature | -5–70 °C23–158 °F |
| Certification | FCC |
| Idle Current | 0.050 A50 mA |
| Connectivity | |
| Connector | Molex |
| Wire Length | 200 mm7.87 in |
| Baud Rate | 7.8 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 | Top 10% Lighter than 94% of 145 Digital Large servos |
| Stall Current | Above Average Lower draw than 75% of 97 Digital Large servos |
Performance Analysis
| Shaft Power | 4.58 W |
| Power Density | 1.171 W/in³ More power-dense than 39% of 110 Digital Large servos |
| Torque Density | 4.5596 oz-in/g |
| Torque-to-Volume Ratio | 65.23 oz-in/in³ |
| Speed-to-Weight | 0.17368 (1/sec·g) |
| Speed-Torque Trade-off | 26.25 |
| Current-per-Torque Ratio | 0.0086 A/oz-in |
| Idle-to-Running Current Ratio | 0.023 |
| No-Load vs Stall Current Spread | 1.00 |
| Voltage Range Width | 3.0 V Wider voltage range than 45% of 131 Digital Large servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0003 1st-highest dead-band-to-pulse-width ratio of 59 Robotics servos |
Notes
The AX-18A is a high-performance version of the AX-12A, featuring nearly twice the speed and higher torque. It includes a metal 4th gear for enhanced durability.
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