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Technical Specifications
Last Updated: 2026-10-10
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 |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 5–8.4 V |
| Connectivity | |
| Connector | JR (Universal) |
| Wire Length | 265 mm10.43 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 1043 Digital Standard servos at 5.0V |
| Speed | Average Faster than 38% of 1041 Digital Standard servos at 5.0V |
| Weight | Below Average Lighter than 19% of 1902 Digital Standard servos |
Performance Analysis
| Shaft Power | 5.65–9.34 W |
| Power Density | 4.784 W/in³ More power-dense than 77% of 1759 Digital Standard servos |
| Torque Density | 6.0312 oz-in/g Stronger than 87% of 1036 Digital Standard servos |
| Torque-to-Volume Ratio | 234.79 oz-in/in³ Denser torque than 88% of 1042 Digital Standard servos |
| Speed-to-Weight | 0.08772 (1/sec·g) Faster than 21% of 1033 Digital Standard servos |
| Speed-Torque Trade-off | 68.76 Better balanced than 88% of 1031 Digital Standard servos |
| Torque Gain per Volt | 6.24%/V More voltage-responsive (torque) than 6% of 850 Digital Standard servos |
| Speed Gain per Volt | 10.70%/V More voltage-responsive (speed) than 23% of 871 Digital Standard servos |
| Voltage Range Width | 3.4 V Wider voltage range than 71% of 1539 Digital Standard servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0010 Finer dead band than 81% of 468 Digital Standard servos |
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