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Technical Specifications
Last Updated: 2026-10-10
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | CYS-BLS9120 |
| Category | Hobby |
| Performance | |
| Torque |
7.2V
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 A3000–3000 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 |
| 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 53% of 1043 Digital Standard servos at 6.0V |
| Speed | Above Average Faster than 77% of 1041 Digital Standard servos at 6.0V |
| Weight | Bottom 10% Lighter than 7% of 1902 Digital Standard servos |
| Running Current | Above Average Lower draw than 80% of 173 Digital Standard servos at 6.0V |
| Stall Current | Average Lower draw than 57% of 539 Digital Standard servos |
Performance Analysis
| Shaft Power | 4.37 W |
| Power Density | 2.161 W/in³ More power-dense than 47% of 1759 Digital Standard servos |
| Torque Density | 2.8792 oz-in/g Stronger than 40% of 1036 Digital Standard servos |
| Torque-to-Volume Ratio | 116.85 oz-in/in³ Denser torque than 50% of 1042 Digital Standard servos |
| Speed-to-Weight | 0.12195 (1/sec·g) Faster than 54% of 1033 Digital Standard servos |
| Speed-Torque Trade-off | 23.61 Better balanced than 43% of 1031 Digital Standard servos |
| Current-per-Torque Ratio | 0.0127 A/oz-in More efficient than 62% of 315 Digital Standard servos |
| Idle-to-Running Current Ratio | 0.167 Lower idle draw than 33% of 112 Digital Standard servos |
| No-Load vs Stall Current Spread | 25.00 Narrower current spread than 34% of 132 Digital Standard servos |
| Speed Gain per Volt | 17.86%/V More voltage-responsive (speed) than 66% of 871 Digital Standard servos |
| Voltage Range Width | 1.4 V Wider voltage range than 34% of 1539 Digital Standard servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0020 Finer dead band than 29% of 468 Digital Standard servos |
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