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Technical Specifications
Last Updated: 2026-10-26
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | RD-B7640HV-180 |
| Category | Robotics |
| Performance | |
| Torque |
8.4V
555.60 oz-in
40.01 kg-cm
3.9 N-m
7.2V
486.15 oz-in
35.01 kg-cm
3.4 N-m
5.0V
458.37 oz-in
33.01 kg-cm
3.2 N-m
Above Average
|
| Speed |
8.4V
0.11 sec/60°
545.5 deg/s
90.9 RPM
7.2V
0.13 sec/60°
461.5 deg/s
76.9 RPM
5.0V
0.15 sec/60°
400.0 deg/s
66.7 RPM
Average
|
| Physical | |
| Weight | 2.68 oz76.0 gBelow Average |
| Shape | Boxed |
| Dimensions |
L 1.575 in W 0.787 in H 1.575 in L 40.0 mm W 20.0 mm H 40.0 mm |
| Case Material | Aluminum |
| Drivetrain | |
| Motor Type | Brushless |
| Gears | Metal |
| Gear Spline/Teeth | 25 T |
| Rotation Mode | Positional |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Digital |
| Rotational Range | 180° |
| Pulse Cycle | 3.03 ms |
| Pulse Width | 500-2500 µs |
| Neutral Position | 1500 µs |
| Dead Band | 2 µs |
| Refresh Rate | 330 Hz |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 5–8.4 V |
| Connectivity | |
| Connector | JR (Universal) |
| Wire Length | 265 mm10.43 in |
| 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 | Above Average Stronger than 89% of 1060 Digital Standard servos at 5.0V |
| Speed | Average Faster than 40% of 1045 Digital Standard servos at 5.0V |
| Weight | Below Average Lighter than 20% of 1880 Digital Standard servos |
Performance Analysis
| Shaft Power | 5.65–9.34 W |
| Power Density | 4.784 W/in³ More power-dense than 77% of 1768 Digital Standard servos |
| Torque Density | 6.0312 oz-in/g Stronger than 88% of 1053 Digital Standard servos |
| Torque-to-Volume Ratio | 234.79 oz-in/in³ Denser torque than 89% of 1058 Digital Standard servos |
| Speed-to-Weight | 0.08772 (1/sec·g) Faster than 22% of 1038 Digital Standard servos |
| Speed-Torque Trade-off | 68.76 Better balanced than 89% of 1034 Digital Standard servos |
| Torque Gain per Volt | 6.24%/V More voltage-responsive (torque) than 5% of 873 Digital Standard servos |
| Speed Gain per Volt | 10.70%/V More voltage-responsive (speed) than 22% of 874 Digital Standard servos |
| Voltage Range Width | 3.4 V Wider voltage range than 71% of 1560 Digital Standard servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0010 Finer dead band than 80% of 504 Digital Standard servos |
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