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Technical Specifications
Last Updated: 2026-10-10
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | FS0391T |
| Category | Hobby |
| Performance | |
| Torque |
8.4V
116.68 oz-in
8.40 kg-cm
0.8 N-m
7.4V
102.79 oz-in
7.40 kg-cm
0.7 N-m
6.0V
83.34 oz-in
6.00 kg-cm
0.6 N-m
Below Average
|
| Speed |
8.4V
0.03 sec/60°
2,000.0 deg/s
333.3 RPM
7.4V
0.03 sec/60°
2,000.0 deg/s
333.3 RPM
6.0V
0.04 sec/60°
1,500.0 deg/s
250.0 RPM
Top 10%
|
| Physical | |
| Weight | 1.76 oz50.0 gAbove Average |
| Dimensions |
L 1.42 in W 0.59 in H 1.40 in L 36.1 mm W 15.0 mm H 35.6 mm |
| Case Material | Aluminum |
| Drivetrain | |
| Motor Type | Coreless |
| Gears | Metal |
| Control & Signal | |
| Modulation | Digital |
| Neutral Position | 760 µs |
| Refresh Rate | 333 Hz |
| Electrical & Environment | |
| Operating Voltage | 6–8.4 V |
| Connectivity | |
| Connector | JR (Universal) estimate |
| 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 | Below Average Stronger than 14% of 1043 Digital Standard servos at 6.0V |
| Speed | Top 10% Faster than 99% of 1041 Digital Standard servos at 6.0V |
| Weight | Above Average Lighter than 85% of 1902 Digital Standard servos |
Performance Analysis
| Shaft Power | 3.85–7.19 W |
| Power Density | 6.131 W/in³ More power-dense than 85% of 1759 Digital Standard servos |
| Torque Density | 1.6668 oz-in/g Stronger than 14% of 1036 Digital Standard servos |
| Torque-to-Volume Ratio | 71.05 oz-in/in³ Denser torque than 26% of 1042 Digital Standard servos |
| Speed-to-Weight | 0.50000 (1/sec·g) Faster than 99% of 1033 Digital Standard servos |
| Speed-Torque Trade-off | 3.33 Better balanced than 4% of 1031 Digital Standard servos |
| Torque Gain per Volt | 16.67%/V More voltage-responsive (torque) than 60% of 850 Digital Standard servos |
| Speed Gain per Volt | 13.89%/V More voltage-responsive (speed) than 39% 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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