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Technical Specifications
Last Updated: 2026-10-24
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | CYS-BLS9120 |
| Category | Hobby |
| Performance | |
| Torque |
7.4V
277.75 oz-in
20.00 kg-cm
2.0 N-m
6.0V
236.09 oz-in
17.00 kg-cm
1.7 N-m
Average
|
| 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
Above Average
|
| Running Current |
7.4V
0.150 A
150 mA
6.0V
0.120 A
120 mA
Above Average
|
| Stall Current | 3–3.8 A3000–3800 mAAverage |
| Physical | |
| Weight | 2.89 oz82.0 gBottom 10% |
| Dimensions |
L 1.575 in W 0.787 in H 1.63 in L 40.0 mm W 20.0 mm H 41.4 mm |
| Drivetrain | |
| Motor Type | Brushless |
| Gears | Steel |
| Gear Spline/Teeth | 25 T |
| Rotation Mode | Positional |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Digital |
| Direction | Counterclockwise |
| Rotational Range | 90° |
| Pulse Width | 1000-2000 µs |
| Neutral Position | 1500 µs |
| Dead Band | 2 µs |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 6–7.4 V |
| Temperature | -10–50 °C14–122 °F |
| Water Rating | Waterproof |
| Idle Current | 0.020 A20 mA |
| Connectivity | |
| Connector | JR (Universal) estimate |
| 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 | Average Stronger than 54% of 1060 Digital Standard servos at 6.0V |
| Speed | Above Average Faster than 78% of 1045 Digital Standard servos at 6.0V |
| Weight | Bottom 10% Lighter than 8% of 1880 Digital Standard servos |
| Running Current | Above Average Lower draw than 78% of 226 Digital Standard servos at 6.0V |
| Stall Current | Average Lower draw than 40% of 570 Digital Standard servos |
Performance Analysis
| Shaft Power | 4.37–6.42 W |
| Power Density | 3.177 W/in³ More power-dense than 62% of 1768 Digital Standard servos |
| Torque Density | 2.8792 oz-in/g Stronger than 40% of 1053 Digital Standard servos |
| Torque-to-Volume Ratio | 116.85 oz-in/in³ Denser torque than 51% of 1058 Digital Standard servos |
| Speed-to-Weight | 0.12195 (1/sec·g) Faster than 55% of 1038 Digital Standard servos |
| Speed-Torque Trade-off | 23.61 Better balanced than 43% of 1034 Digital Standard servos |
| Current-per-Torque Ratio | 0.0161 A/oz-in More efficient than 45% of 331 Digital Standard servos |
| Idle-to-Running Current Ratio | 0.167 Lower idle draw than 24% of 167 Digital Standard servos |
| No-Load vs Stall Current Spread | 31.67 Narrower current spread than 28% of 179 Digital Standard servos |
| Torque Gain per Volt | 12.60%/V More voltage-responsive (torque) than 31% of 873 Digital Standard servos |
| Speed Gain per Volt | 17.86%/V More voltage-responsive (speed) than 66% of 874 Digital Standard servos |
| Voltage Range Width | 1.4 V Wider voltage range than 34% of 1560 Digital Standard servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0020 Finer dead band than 31% of 504 Digital Standard servos |
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