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Technical Specifications
Last Updated: 2026-10-23
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | A81BHM |
| Category | Hobby |
| Performance | |
| Torque |
8.4V
625.00 oz-in
45.00 kg-cm
4.4 N-m
7.4V
542.00 oz-in
39.03 kg-cm
3.8 N-m
6.0V
473.00 oz-in
34.06 kg-cm
3.3 N-m
4.8V
389.00 oz-in
28.01 kg-cm
2.7 N-m
Above Average
|
| Speed |
8.4V
0.09 sec/60°
705.9 deg/s
117.6 RPM
7.4V
0.10 sec/60°
600.0 deg/s
100.0 RPM
6.0V
0.12 sec/60°
521.7 deg/s
87.0 RPM
4.8V
0.14 sec/60°
428.6 deg/s
71.4 RPM
Average
|
| Physical | |
| Weight | 2.93 oz83.0 gBottom 10% |
| Dimensions |
L 1.57 in W 0.79 in H 1.46 in L 39.9 mm W 20.1 mm H 37.1 mm |
| Case Material | Aluminum |
| Drivetrain | |
| Motor Type | Brushless |
| Gears | Steel |
| Gear Spline/Teeth | 25 T |
| Rotation Mode | Positional |
| Rotation/Support | Triple Bearings |
| Control & Signal | |
| Modulation | Digital |
| Direction | Counterclockwise |
| Rotational Range | 180° |
| Pulse Width | 500-2500 µs |
| Dead Band | 2 µs |
| Refresh Rate | 333 Hz |
| Programmable | Yes |
| Electrical & Environment | |
| Operating Voltage | 4.8–8.4 V |
| Temperature | -15–70 °C5–158 °F |
| Connectivity | |
| Connector | JR (Universal) |
| Wire Length | 300 mm11.81 in |
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 | Above Average Stronger than 83% of 1060 Digital Standard servos at 4.8V |
| Speed | Average Faster than 48% of 1045 Digital Standard servos at 4.8V |
| Weight | Bottom 10% Lighter than 6% of 1880 Digital Standard servos |
Performance Analysis
| Shaft Power | 5.14–13.60 W |
| Power Density | 7.508 W/in³ More power-dense than 93% of 1768 Digital Standard servos |
| Torque Density | 4.6868 oz-in/g Stronger than 73% of 1053 Digital Standard servos |
| Torque-to-Volume Ratio | 214.82 oz-in/in³ Denser torque than 87% of 1058 Digital Standard servos |
| Speed-to-Weight | 0.08606 (1/sec·g) Faster than 19% of 1038 Digital Standard servos |
| Speed-Torque Trade-off | 54.46 Better balanced than 81% of 1034 Digital Standard servos |
| Torque Gain per Volt | 16.85%/V More voltage-responsive (torque) than 61% of 873 Digital Standard servos |
| Speed Gain per Volt | 17.97%/V More voltage-responsive (speed) than 69% of 874 Digital Standard servos |
| Voltage Range Width | 3.6 V Wider voltage range than 80% of 1560 Digital Standard servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0010 Finer dead band than 75% of 504 Digital Standard servos |
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