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Technical Specifications
Last Updated: 2026-10-23
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | A81BMWP |
| Category | Hobby |
| Performance | |
| Torque |
8.4V
763.80 oz-in
55.00 kg-cm
5.4 N-m
7.4V
666.60 oz-in
48.00 kg-cm
4.7 N-m
6.0V
541.60 oz-in
39.00 kg-cm
3.8 N-m
4.8V
444.40 oz-in
32.00 kg-cm
3.1 N-m
Above Average
|
| Speed |
8.4V
0.09 sec/60°
689.7 deg/s
114.9 RPM
7.4V
0.10 sec/60°
600.0 deg/s
100.0 RPM
6.0V
0.13 sec/60°
480.0 deg/s
80.0 RPM
4.8V
0.15 sec/60°
413.8 deg/s
69.0 RPM
Average
|
| Physical | |
| Weight | 2.93 oz83.0 gBottom 10% |
| Dimensions |
L 1.57 in W 0.79 in H 1.48 in L 39.9 mm W 20.1 mm H 37.6 mm |
| Case Material | Aluminum |
| Drivetrain | |
| Motor Type | Brushless |
| Motor Drive | FET |
| Gears | Steel |
| Gear Spline/Teeth | 25 T |
| Rotation/Support | Triple Bearings |
| Control & Signal | |
| Modulation | Digital |
| Direction | Counterclockwise |
| Rotational Range | 180° |
| Mechanical Limit | No Limit |
| Pulse Cycle | 3.003 ms |
| Pulse Width | 500-2500 µs |
| Neutral Position | 1520 µs |
| Dead Band | 2 µs |
| Refresh Rate | 333 Hz |
| Angle Sensor | Magnetic Encoder |
| Control System | PWM |
| Programmable | Yes |
| Electrical & Environment | |
| Operating Voltage | 4.8–8.4 V |
| Temperature | -15–70 °C5–158 °F |
| Water Rating | IP67 |
| Certification | CE | ROHS | FCC |
| 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 88% of 1060 Digital Standard servos at 4.8V |
| Speed | Average Faster than 45% of 1045 Digital Standard servos at 4.8V |
| Weight | Bottom 10% Lighter than 6% of 1880 Digital Standard servos |
Performance Analysis
| Shaft Power | 5.67–16.23 W |
| Power Density | 8.843 W/in³ More power-dense than 97% of 1768 Digital Standard servos |
| Torque Density | 5.3542 oz-in/g Stronger than 83% of 1053 Digital Standard servos |
| Torque-to-Volume Ratio | 242.10 oz-in/in³ Denser torque than 90% of 1058 Digital Standard servos |
| Speed-to-Weight | 0.08309 (1/sec·g) Faster than 17% of 1038 Digital Standard servos |
| Speed-Torque Trade-off | 64.44 Better balanced than 87% of 1034 Digital Standard servos |
| Torque Gain per Volt | 19.96%/V More voltage-responsive (torque) than 77% of 873 Digital Standard servos |
| Speed Gain per Volt | 18.52%/V More voltage-responsive (speed) than 71% 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 74% of 504 Digital Standard servos |
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Reviews (1)
Includes 1 review aggregated from around the web.
There are few reviews for this servo on the web. A Reddit builder who chose it for the front axle of a crawler calls it a decent strong servo, though notes it is pricey compared to another model.
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