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Technical Specifications
Last Updated: 2026-10-26
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 gBelow Average |
| 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 84% of 1060 Digital Standard servos at 6.0V |
| Speed | Average Faster than 63% of 1045 Digital Standard servos at 6.0V |
| Weight | Below Average Lighter than 10% of 1880 Digital Standard servos |
Performance Analysis
| Shaft Power | 6.21–10.84 W |
| Power Density | 5.499 W/in³ More power-dense than 82% of 1768 Digital Standard servos |
| Torque Density | 5.0351 oz-in/g Stronger than 79% of 1053 Digital Standard servos |
| Torque-to-Volume Ratio | 204.26 oz-in/in³ Denser torque than 83% of 1058 Digital Standard servos |
| Speed-to-Weight | 0.10417 (1/sec·g) Faster than 39% of 1038 Digital Standard servos |
| Speed-Torque Trade-off | 48.34 Better balanced than 74% of 1034 Digital Standard servos |
| Torque Gain per Volt | 12.93%/V More voltage-responsive (torque) than 33% of 873 Digital Standard servos |
| Speed Gain per Volt | 13.89%/V More voltage-responsive (speed) than 41% of 874 Digital Standard servos |
| Voltage Range Width | 2.4 V Wider voltage range than 49% of 1560 Digital Standard servos |
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