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Technical Specifications
Last Updated: 2026-10-08| Identity | |
| Brand |  |
| Product Number | KST-X08 |
| Category | Hobby |
| Performance | |
| Torque |
8.4V
38.87 oz-in
2.80 kg-cm
0.3 N-m
6.0V
30.53 oz-in
2.20 kg-cm
0.2 N-m
3.8V
19.43 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
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 |
| Motor Drive | FET |
| Gears | Aluminum |
| Rotation Mode | Positional |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Digital |
| Rotational Range | 120° |
| Pulse Cycle | 3 ms |
| Pulse Width | 1000-2000 µs |
| Neutral Position | 1500 µs |
| Control System | PWM |
| Programmable | Yes |
| Signal Voltage | 3-5V |
| Electrical & Environment | |
| Operating Voltage | 3.8–8.4 V |
| Connectivity | |
| Connector | JR (Universal) |
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 23% of 349 Digital Micro servos at 3.8V |
| Speed | Bottom 10% Faster than 8% of 347 Digital Micro servos at 3.8V |
| Weight | Above Average Lighter than 75% of 597 Digital Micro servos |
Performance Analysis
| Shaft Power | 0.20–0.80 W |
| Power Density | 4.143 W/in³ More power-dense than 73% of 563 Digital Micro servos |
| Torque Density | 2.4288 oz-in/g Stronger than 49% of 349 Digital Micro servos |
| Torque-to-Volume Ratio | 100.80 oz-in/in³ Denser torque than 71% of 345 Digital Micro servos |
| Speed-to-Weight | 0.69444 (1/sec·g) Faster than 46% of 347 Digital Micro servos |
| Speed-Torque Trade-off | 3.50 Better balanced than 56% of 345 Digital Micro servos |
| Torque Gain per Volt | 21.75%/V More voltage-responsive (torque) than 79% of 290 Digital Micro servos |
| Speed Gain per Volt | 21.75%/V More voltage-responsive (speed) than 74% of 295 Digital Micro servos |
| Voltage Range Width | 4.6 V Wider voltage range than 95% of 496 Digital Micro servos |
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Reviews (94)
Includes 94 reviews aggregated from around the web.
Owners are very happy with this tiny 8 mm servo, especially in hand-launch gliders, sailplanes and other thin-winged models. A leading hobby retailer shows a perfect 5.0 average from 16 reviews, and buyers on other shops praise the build quality, the clean fit in very thin wings and its suitability as an aileron servo on 1S or 2S. One forum user said it is a bit slower than other servos at lower voltages but comes up to par at 8 volts, and called the light weight and metal gears perfect for sport flying. Reports of failures are rare.
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