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Technical Specifications
Last Updated: 2026-10-23
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | KM5521MDHV |
| Category | Hobby |
| Performance | |
| Torque |
7.4V
295.86 oz-in
21.30 kg-cm
2.1 N-m
6.0V
256.97 oz-in
18.50 kg-cm
1.8 N-m
Average
|
| Speed |
7.4V
0.14 sec/60°
428.6 deg/s
71.4 RPM
6.0V
0.16 sec/60°
375.0 deg/s
62.5 RPM
Below Average
|
| Physical | |
| Weight | 2.24 oz63.5 gAverage |
| Dimensions |
L 1.59 in W 0.80 in H 1.42 in L 40.4 mm W 20.3 mm H 36.1 mm |
| Case Material | Aluminum |
| Drivetrain | |
| Motor Type | Coreless |
| Gears | Steel |
| Gear Spline/Teeth | 25 T |
| Rotation Mode | Positional |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Digital |
| Rotational Range | 180° |
| Mechanical Limit | 180° |
| Pulse Cycle | 3.03 ms |
| Pulse Width | 500-2500 µs |
| Neutral Position | 1520 µs |
| Dead Band | 2 µs |
| Refresh Rate | 330 Hz |
| Programmable | Yes |
| Electrical & Environment | |
| Operating Voltage | 6–7.4 V |
| Temperature | -10–50 °C14–122 °F |
| Water Rating | None |
| 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 | Average Stronger than 60% of 1060 Digital Standard servos at 6.0V |
| Speed | Below Average Faster than 32% of 1045 Digital Standard servos at 6.0V |
| Weight | Average Lighter than 48% of 1880 Digital Standard servos |
Performance Analysis
| Shaft Power | 2.97–3.91 W |
| Power Density | 2.163 W/in³ More power-dense than 47% of 1768 Digital Standard servos |
| Torque Density | 4.0468 oz-in/g Stronger than 63% of 1053 Digital Standard servos |
| Torque-to-Volume Ratio | 142.27 oz-in/in³ Denser torque than 62% of 1058 Digital Standard servos |
| Speed-to-Weight | 0.09843 (1/sec·g) Faster than 34% of 1038 Digital Standard servos |
| Speed-Torque Trade-off | 41.12 Better balanced than 66% of 1034 Digital Standard servos |
| Torque Gain per Volt | 10.81%/V More voltage-responsive (torque) than 22% of 873 Digital Standard servos |
| Speed Gain per Volt | 10.21%/V More voltage-responsive (speed) than 18% of 874 Digital Standard servos |
| Voltage Range Width | 1.4 V Wider voltage range than 29% of 1560 Digital Standard servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0010 Finer dead band than 81% of 504 Digital Standard servos |
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