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Technical Specifications
Last Updated: 2026-10-23
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | JR77438 |
| Category | Hobby |
| Performance | |
| Torque |
8.4V
41.70 oz-in
3.00 kg-cm
0.3 N-m
7.0V
34.70 oz-in
2.50 kg-cm
0.2 N-m
6.0V
28.80 oz-in
2.07 kg-cm
0.2 N-m
5.0V
24.80 oz-in
1.79 kg-cm
0.2 N-m
|
| Speed |
8.4V
0.08 sec/60°
750.0 deg/s
125.0 RPM
7.0V
0.09 sec/60°
666.7 deg/s
111.1 RPM
6.0V
0.11 sec/60°
545.5 deg/s
90.9 RPM
5.0V
0.13 sec/60°
461.5 deg/s
76.9 RPM
|
| Physical | |
| Weight | 0.35 oz10.0 gAverage |
| Dimensions |
L 0.906 in W 0.472 in H 0.866 in L 23.0 mm W 12.0 mm H 22.0 mm |
| Case Material | Metal |
| Drivetrain | |
| Motor Type | Coreless |
| Gears | Hybrid |
| Control & Signal | |
| Modulation | Digital |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 4.5–7 V |
| Connectivity | |
| Connector | JR (Universal) estimate |
| Wire Length | 17 mm0.67 in |
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
| Weight | Average Lighter than 55% of 597 Digital Micro servos |
Performance Analysis
| Shaft Power | 0.35–0.96 W |
| Power Density | 2.601 W/in³ More power-dense than 60% of 563 Digital Micro servos |
| Torque Density | 2.4800 oz-in/g |
| Torque-to-Volume Ratio | 66.94 oz-in/in³ |
| Speed-to-Weight | 0.76923 (1/sec·g) |
| Speed-Torque Trade-off | 3.22 |
| Voltage Range Width | 2.5 V Wider voltage range than 69% of 496 Digital Micro servos |
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Reviews (5)
Includes 5 reviews aggregated from around the web.
There are few reviews for this servo on the web. About five buyers rated it 4 to 5 stars and all were happy. They call it very smooth, quiet and precise, with great centering and strong torque for its size, and note it never glitched. It is used on rudder and elevator of a sport model and on a small EDF jet, runs fine on 6.6V in a gas model, and is considered excellent value.
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