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Technical Specifications
Last Updated: 2026-10-08
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | KST-0021 |
| Category | Hobby |
| Performance | |
| Torque |
8.4V
38.89 oz-in
2.80 kg-cm
0.3 N-m
7.4V
37.50 oz-in
2.70 kg-cm
0.3 N-m
6.0V
30.56 oz-in
2.20 kg-cm
0.2 N-m
3.8V
19.45 oz-in
1.40 kg-cm
0.1 N-m
Below Average
|
| Speed |
8.4V
0.09 sec/60°
666.7 deg/s
111.1 RPM
7.4V
0.12 sec/60°
500.0 deg/s
83.3 RPM
6.0V
0.15 sec/60°
400.0 deg/s
66.7 RPM
3.8V
0.18 sec/60°
333.3 deg/s
55.6 RPM
Bottom 10%
|
| Physical | |
| Weight | 0.28 oz8.0 gAbove Average |
| Dimensions |
L 0.925 in W 0.315 in H 0.661 in L 23.5 mm W 8.0 mm H 16.8 mm |
| Case Material | Aluminum |
| Drivetrain | |
| Motor Type | Coreless |
| Gears | Aluminum |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Digital |
| Rotational Range | 120° |
| Pulse Cycle | 3.003 ms |
| Pulse Width | 900-2100 µs |
| Neutral Position | 1520 µs |
| Refresh Rate | 333 Hz |
| Angle Sensor | Potentiometer |
| Control System | PWM |
| Programmable | Yes |
| Electrical & Environment | |
| Operating Voltage | 3.8–8.4 V |
| Temperature | -10–50 °C14–122 °F |
| Connectivity | |
| Connector | JR (Universal) estimate |
| Wire Length | 150 mm5.91 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 | Below Average Stronger than 26% of 328 Digital Micro servos at 3.8V |
| Speed | Bottom 10% Faster than 7% of 328 Digital Micro servos at 3.8V |
| Weight | Above Average Lighter than 69% of 620 Digital Micro servos |
Performance Analysis
| Shaft Power | 0.20–0.80 W |
| Power Density | 4.145 W/in³ More power-dense than 72% of 590 Digital Micro servos |
| Torque Density | 2.4313 oz-in/g Stronger than 51% of 327 Digital Micro servos |
| Torque-to-Volume Ratio | 100.90 oz-in/in³ Denser torque than 72% of 327 Digital Micro servos |
| Speed-to-Weight | 0.69444 (1/sec·g) Faster than 44% of 327 Digital Micro servos |
| Speed-Torque Trade-off | 3.50 Better balanced than 60% of 327 Digital Micro servos |
| Torque Gain per Volt | 21.73%/V More voltage-responsive (torque) than 78% of 268 Digital Micro servos |
| Speed Gain per Volt | 21.75%/V More voltage-responsive (speed) than 72% of 273 Digital Micro servos |
| Voltage Range Width | 4.6 V Wider voltage range than 94% of 511 Digital Micro servos |
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