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Technical Specifications
Last Updated: 2026-10-10
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | FHS21 |
| Category | Hobby |
| Performance | |
| Torque |
7.0V
416.61 oz-in
30.00 kg-cm
2.9 N-m
6.0V
369.39 oz-in
26.60 kg-cm
2.6 N-m
Above Average
5.0V
309.68 oz-in
22.30 kg-cm
2.2 N-m
|
| Speed |
7.0V
0.22 sec/60°
272.7 deg/s
45.5 RPM
6.0V
0.27 sec/60°
222.2 deg/s
37.0 RPM
Bottom 10%
5.0V
0.32 sec/60°
187.5 deg/s
31.3 RPM
|
| Stall Current | 4.5–6.8 A4500–6800 mABelow Average |
| Physical | |
| Weight | 2.75 oz78.0 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 | Cored |
| Motor Drive | MOS |
| Gears | Steel |
| Gear Spline/Teeth | 25 T |
| Rotation Mode | Positional |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Digital |
| Rotational Range | 180° |
| Mechanical Limit | 180° |
| Pulse Width | 500-2500 µs |
| Neutral Position | 1500 µs |
| Dead Band | 1 µs |
| Angle Sensor | Potentiometer |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 6–8.4 V |
| Temperature | -20–60 °C-4–140 °F |
| 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 79% of 1043 Digital Standard servos at 6.0V |
| Speed | Bottom 10% Faster than 1% of 1041 Digital Standard servos at 6.0V |
| Weight | Below Average Lighter than 15% of 1902 Digital Standard servos |
| Stall Current | Below Average Lower draw than 12% of 539 Digital Standard servos |
Performance Analysis
| Shaft Power | 1.79–3.50 W |
| Power Density | 1.775 W/in³ More power-dense than 38% of 1759 Digital Standard servos |
| Torque Density | 4.7358 oz-in/g Stronger than 74% of 1036 Digital Standard servos |
| Torque-to-Volume Ratio | 187.31 oz-in/in³ Denser torque than 77% of 1042 Digital Standard servos |
| Speed-to-Weight | 0.04748 (1/sec·g) Faster than 1% of 1033 Digital Standard servos |
| Speed-Torque Trade-off | 99.75 Better balanced than 96% of 1031 Digital Standard servos |
| Current-per-Torque Ratio | 0.0184 A/oz-in More efficient than 36% of 315 Digital Standard servos |
| Voltage Range Width | 2.4 V Wider voltage range than 49% of 1539 Digital Standard servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0005 Finer dead band than 95% of 468 Digital Standard servos |
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