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Technical Specifications
Last Updated: 2026-10-27
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | CYS-S8221 |
| Category | Hobby |
| Discontinued | Yes |
| Performance | |
| Torque |
7.4V
16.66 oz-in
1.20 kg-cm
0.1 N-m
6.0V
13.89 oz-in
1.00 kg-cm
0.1 N-m
|
| Speed |
7.4V
0.08 sec/60°
750.0 deg/s
125.0 RPM
6.0V
0.10 sec/60°
600.0 deg/s
100.0 RPM
|
| Stall Current | 0.9–1 A900–1000 mAAverage |
| Physical | |
| Weight | 0.46 oz13.0 gAverage |
| Dimensions |
L 0.902 in W 0.472 in H 1.00 in L 22.9 mm W 12.0 mm H 25.4 mm |
| Case Material | Aluminum |
| Drivetrain | |
| Motor Type | Cored |
| Gears | Metal |
| Gear Spline/Teeth | 21 T |
| Rotation/Support | Single Bearing |
| Control & Signal | |
| Modulation | Digital |
| Direction | Counterclockwise |
| Rotational Range | 90° |
| Pulse Cycle | 20 ms |
| Pulse Width | 1000-2000 µs |
| Neutral Position | 1500 µs |
| Dead Band | 2 µs |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 4.8–6 V |
| Temperature | -10–50 °C14–122 °F |
| Connectivity | |
| Connector | JR (Universal) |
| Wire Length | 180 mm7.09 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
| Weight | Average Lighter than 36% of 597 Digital Micro servos |
| Stall Current | Average Lower draw than 53% of 188 Digital Micro servos |
Performance Analysis
| Shaft Power | 0.26–0.39 W |
| Power Density | 0.905 W/in³ More power-dense than 12% of 563 Digital Micro servos |
| Torque Density | 1.0685 oz-in/g |
| Torque-to-Volume Ratio | 32.63 oz-in/in³ |
| Speed-to-Weight | 0.76923 (1/sec·g) |
| Speed-Torque Trade-off | 1.39 |
| Current-per-Torque Ratio | 0.0720 A/oz-in |
| Voltage Range Width | 1.2 V Wider voltage range than 29% of 496 Digital Micro servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0020 Finer dead band than 30% of 182 Digital Micro servos |
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