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Technical Specifications
Last Updated: 2026-10-08
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | CYS-S8218 |
| Category | Hobby |
| Performance | |
| Torque |
7.2V
555.50 oz-in
40.00 kg-cm
3.9 N-m
6.0V
527.72 oz-in
38.00 kg-cm
3.7 N-m
Below Average
|
| Speed |
7.2V
0.18 sec/60°
333.3 deg/s
55.6 RPM
6.0V
0.20 sec/60°
300.0 deg/s
50.0 RPM
Average
|
| Running Current |
7.4V
0.200 A
200 mA
6.0V
0.180 A
180 mA
Above Average
|
| Stall Current | 7.5–8.6 A7500–8600 mAAverage |
| Physical | |
| Weight | 5.78 oz164.0 gAbove Average |
| Dimensions |
L 2.343 in W 1.15 in H 2.173 in L 59.5 mm W 29.2 mm H 55.2 mm |
| Drivetrain | |
| Motor Type | NdFeB |
| Gears | Metal |
| Gear Spline/Teeth | 17 T |
| Rotation Mode | Positional |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Digital |
| Direction | Counterclockwise |
| Rotational Range | 90° |
| Pulse Cycle | 50 ms |
| Pulse Width | 1000-2000 µs |
| Neutral Position | 1500 µs |
| Dead Band | 4 µs |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 6–7.4 V |
| Temperature | -10–50 °C14–122 °F |
| Idle Current | 0.020 A20 mA |
| Connectivity | |
| Connector | JR (Universal) |
| Wire Length | 300 mm11.81 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 29% of 93 Digital Giant servos at 6.0V |
| Speed | Average Faster than 42% of 90 Digital Giant servos at 6.0V |
| Weight | Above Average Lighter than 80% of 174 Digital Giant servos |
| Running Current | Above Average Lower draw than 86% of 29 Digital Giant servos at 6.0V |
| Stall Current | Average Lower draw than 48% of 102 Digital Giant servos |
Performance Analysis
| Shaft Power | 4.88–5.71 W |
| Power Density | 0.975 W/in³ More power-dense than 35% of 132 Digital Giant servos |
| Torque Density | 3.2178 oz-in/g Stronger than 45% of 90 Digital Giant servos |
| Torque-to-Volume Ratio | 90.13 oz-in/in³ Denser torque than 36% of 93 Digital Giant servos |
| Speed-to-Weight | 0.03049 (1/sec·g) Faster than 69% of 87 Digital Giant servos |
| Speed-Torque Trade-off | 105.54 Better balanced than 38% of 89 Digital Giant servos |
| Current-per-Torque Ratio | 0.0163 A/oz-in More efficient than 16% of 50 Digital Giant servos |
| Idle-to-Running Current Ratio | 0.111 Lower idle draw than 72% of 44 Cys servos |
| No-Load vs Stall Current Spread | 47.78 Narrower current spread than 23% of 27 Digital Giant servos |
| Voltage Range Width | 1.4 V Wider voltage range than 28% of 160 Digital Giant servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0040 Finer dead band than 9% of 36 Digital Giant servos |
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