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Technical Specifications
Last Updated: 2026-07-10
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Identity
Performance
Physical
Drivetrain
Control & Signal
Electrical & Environment
Connectivity
Origin
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Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | CYS-S8221 |
| Category | Hobby |
| 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
|
| 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
|
| Running Current | (add) |
| Stall Current | 0.9–1 A900–1000 mA |
| Physical | |
| Weight | 0.46 oz13.0 g |
| Dimensions |
L 0.90 in W 0.47 in H 1.00 in L 22.9 mm W 12.0 mm H 25.4 mm |
| Case Material | (add) |
| Drivetrain | |
| Motor Type | Brushed |
| Motor Drive | (add) |
| Gears | Metal |
| Gear Spline/Teeth | 21 T |
| Shaft Size | (add) |
| Rotation Mode | (add) |
| Rotation/Support | Single Bearing |
| Backlash | (add) |
| Control & Signal | |
| Modulation | Digital |
| Direction | Counterclockwise |
| Rotational Range | 90° |
| Mechanical Limit | (add) |
| Pulse Cycle | 50 ms |
| Pulse Width | 1000-2000 µs |
| Neutral Position | 1500 µs |
| Dead Band | 2 µs |
| Refresh Rate | (add) |
| Angle Sensor | (add) |
| Control System | PWM |
| Programmable | (add) |
| Signal Voltage | (add) |
| Electrical & Environment | |
| Operating Voltage | 4.8–6 V |
| Power Source | (add) |
| Regulator Type | (add) |
| Temperature | -10–50 °C14–122 °F |
| Water Rating | (add) |
| Certification | (add) |
| Idle Current | (add) |
| 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.
Performance Analysis
| Shaft Power | 0.55–0.92 W |
| Torque Density | 1.6023 oz-in/g Stronger than 15% of the 240 Digital Micro servos in the database |
| Torque-to-Volume Ratio | 48.93 oz-in/in³ Denser torque than 22% of the 242 Digital Micro servos in the database |
| Power Density | 2.171 W/in³ More power-dense than 55% of the 544 Digital Micro servos in the database |
| Speed-to-Weight | 1.09890 (1/sec·g) Faster than 74% of the 240 Digital Micro servos in the database |
| Speed-Torque Trade-off | 1.46 Better balanced than 17% of the 242 Digital Micro servos in the database |
| Current-per-Torque Ratio | 0.0480 A/oz-in More efficient than 41% of the 47 Digital Micro servos in the database |
| Torque Gain per Volt | 16.68%/V More voltage-responsive (torque) than 48% of the 194 Digital Micro servos in the database |
| Speed Gain per Volt | 33.34%/V More voltage-responsive (speed) than 96% of the 196 Digital Micro servos in the database |
| Voltage Range Width | 1.2 V Wider voltage range than 28% of the 407 Digital Micro servos in the database |
| Dead-Band-to-Pulse-Width Ratio | 0.0020 Finer dead band than 19% of the 120 Digital Micro servos in the database |
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