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Technical Specifications
Last Updated: 2026-10-10
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | CLS4038RP |
| Category | Hobby |
| Performance | |
| Torque |
8.4V
527.82 oz-in
38.01 kg-cm
3.7 N-m
7.4V
472.26 oz-in
34.01 kg-cm
3.3 N-m
6.0V
402.81 oz-in
29.01 kg-cm
2.8 N-m
Above Average
|
| Speed |
8.4V
0.09 sec/60°
666.7 deg/s
111.1 RPM
7.4V
0.10 sec/60°
600.0 deg/s
100.0 RPM
6.0V
0.12 sec/60°
500.0 deg/s
83.3 RPM
Average
|
| Physical | |
| Weight | 2.82 oz80.0 gBottom 10% |
| Dimensions |
L 1.57 in W 0.79 in H 1.59 in L 39.9 mm W 20.1 mm H 40.4 mm |
| Case Material | Aluminum |
| Drivetrain | |
| Motor Type | Coreless |
| Gears | Steel |
| Gear Spline/Teeth | 25 T |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Digital |
| Rotational Range | 180° |
| Pulse Width | 500-2500 µs |
| Control System | PWM |
| Programmable | Yes |
| Electrical & Environment | |
| Operating Voltage | 6–8.4 V |
| Water Rating | Waterproof |
| 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 | Above Average Stronger than 83% of 1043 Digital Standard servos at 6.0V |
| Speed | Average Faster than 60% of 1041 Digital Standard servos at 6.0V |
| Weight | Bottom 10% Lighter than 9% of 1902 Digital Standard servos |
Performance Analysis
| Shaft Power | 6.21–10.84 W |
| Power Density | 5.499 W/in³ More power-dense than 81% of 1759 Digital Standard servos |
| Torque Density | 5.0351 oz-in/g Stronger than 78% of 1036 Digital Standard servos |
| Torque-to-Volume Ratio | 204.26 oz-in/in³ Denser torque than 81% of 1042 Digital Standard servos |
| Speed-to-Weight | 0.10417 (1/sec·g) Faster than 38% of 1033 Digital Standard servos |
| Speed-Torque Trade-off | 48.34 Better balanced than 74% of 1031 Digital Standard servos |
| Torque Gain per Volt | 12.93%/V More voltage-responsive (torque) than 32% of 850 Digital Standard servos |
| Speed Gain per Volt | 13.89%/V More voltage-responsive (speed) than 41% of 871 Digital Standard servos |
| Voltage Range Width | 2.4 V Wider voltage range than 49% of 1539 Digital Standard servos |
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