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Technical Specifications
Last Updated: 2026-10-26
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
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
5.0V
0.32 sec/60°
187.5 deg/s
31.3 RPM
|
| Running Current |
7.0V
2.800 A
2,800 mA
6.0V
2.300 A
2,300 mA
5.0V
1.900 A
1,900 mA
|
| 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 | 2 µs |
| Angle Sensor | Potentiometer |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 4.8–7.4 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
| Weight | Below Average Lighter than 16% of 1880 Digital Standard servos |
| Stall Current | Below Average Lower draw than 11% of 570 Digital Standard servos |
Performance Analysis
| Shaft Power | 1.79–3.50 W |
| Power Density | 1.775 W/in³ More power-dense than 38% of 1768 Digital Standard servos |
| Torque Density | 3.9703 oz-in/g |
| Torque-to-Volume Ratio | 157.03 oz-in/in³ |
| Speed-to-Weight | 0.04006 (1/sec·g) |
| Speed-Torque Trade-off | 99.10 |
| Current-per-Torque Ratio | 0.0220 A/oz-in |
| No-Load vs Stall Current Spread | 3.58 |
| Voltage Range Width | 2.6 V Wider voltage range than 64% of 1560 Digital Standard servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0010 Finer dead band than 78% of 504 Digital Standard servos |
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