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Technical Specifications
Last Updated: 2026-10-10
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | CYS-S8221 |
| Category | Hobby |
| Discontinued | Yes |
| Performance | |
| Torque |
6.0V
25.00 oz-in
1.80 kg-cm
0.2 N-m
4.8V
20.83 oz-in
1.50 kg-cm
0.1 N-m
Below Average
|
| Speed |
6.0V
0.05 sec/60°
1,200.0 deg/s
200.0 RPM
4.8V
0.07 sec/60°
857.1 deg/s
142.9 RPM
Top 10%
|
| Stall Current | 0.9–1 A900–1000 mAAverage |
| Physical | |
| Weight | 0.46 oz13.0 gBelow Average |
| 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 | Brushed |
| Gears | Metal |
| Gear Spline/Teeth | 21 T |
| Rotation/Support | Single Bearing |
| Control & Signal | |
| Modulation | Digital |
| Direction | Counterclockwise |
| Rotational Range | 90° |
| Pulse Cycle | 50 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
| Torque | Below Average Stronger than 27% of 328 Digital Micro servos at 4.8V |
| Speed | Top 10% Faster than 91% of 328 Digital Micro servos at 4.8V |
| Weight | Below Average Lighter than 34% of 620 Digital Micro servos |
| Stall Current | Average Lower draw than 46% of 194 Digital Micro servos |
Performance Analysis
| Shaft Power | 0.55–0.92 W |
| Power Density | 2.171 W/in³ More power-dense than 55% of 590 Digital Micro servos |
| Torque Density | 1.6023 oz-in/g Stronger than 14% of 327 Digital Micro servos |
| Torque-to-Volume Ratio | 48.93 oz-in/in³ Denser torque than 20% of 327 Digital Micro servos |
| Speed-to-Weight | 1.09890 (1/sec·g) Faster than 74% of 327 Digital Micro servos |
| Speed-Torque Trade-off | 1.46 Better balanced than 16% of 327 Digital Micro servos |
| Current-per-Torque Ratio | 0.0480 A/oz-in More efficient than 31% of 85 Digital Micro servos |
| Torque Gain per Volt | 16.68%/V More voltage-responsive (torque) than 48% of 268 Digital Micro servos |
| Speed Gain per Volt | 33.34%/V More voltage-responsive (speed) than 96% of 273 Digital Micro servos |
| Voltage Range Width | 1.2 V Wider voltage range than 28% of 511 Digital Micro servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0020 Finer dead band than 24% of 189 Digital Micro servos |
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