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Technical Specifications
Last Updated: 2026-10-23
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | KST-0921 |
| Category | Hobby |
| Performance | |
| Torque |
8.4V
117.98 oz-in
8.50 kg-cm
0.8 N-m
7.4V
111.04 oz-in
8.00 kg-cm
0.8 N-m
6.0V
104.10 oz-in
7.50 kg-cm
0.7 N-m
Top 10%
|
| Speed |
8.4V
0.07 sec/60°
857.1 deg/s
142.9 RPM
7.4V
0.08 sec/60°
750.0 deg/s
125.0 RPM
6.0V
0.09 sec/60°
666.7 deg/s
111.1 RPM
Above Average
|
| Physical | |
| Weight | 0.74 oz21.0 gBelow Average |
| Dimensions |
L 0.945 in W 0.512 in H 1.181 in L 24.0 mm W 13.0 mm H 30.0 mm |
| Case Material | Aluminum |
| Drivetrain | |
| Motor Type | Brushless |
| Gears | Steel |
| Gear Spline/Teeth | 25 T |
| Rotation Mode | Positional |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Digital |
| Rotational Range | 100° |
| Mechanical Limit | 100° |
| Pulse Cycle | 3.003 ms |
| Pulse Width | 1000-2000 µs |
| Neutral Position | 1520 µs |
| Refresh Rate | 333 Hz |
| Angle Sensor | Potentiometer |
| Control System | PWM |
| Programmable | Yes |
| Electrical & Environment | |
| Operating Voltage | 6–8.4 V |
| Temperature | -20–65 °C-4–149 °F |
| Water Rating | IP67 |
| Connectivity | |
| Connector | JR (Universal) estimate |
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 | Top 10% Stronger than 92% of 363 Digital Micro servos at 6.0V |
| Speed | Above Average Faster than 75% of 361 Digital Micro servos at 6.0V |
| Weight | Below Average Lighter than 13% of 665 Digital Micro servos |
Performance Analysis
| Shaft Power | 2.14–3.12 W |
| Power Density | 5.456 W/in³ More power-dense than 83% of 625 Digital Micro servos |
| Torque Density | 4.9571 oz-in/g Stronger than 92% of 363 Digital Micro servos |
| Torque-to-Volume Ratio | 182.25 oz-in/in³ Denser torque than 90% of 359 Digital Micro servos |
| Speed-to-Weight | 0.52910 (1/sec·g) Faster than 29% of 361 Digital Micro servos |
| Speed-Torque Trade-off | 9.37 Better balanced than 86% of 358 Digital Micro servos |
| Torque Gain per Volt | 5.56%/V More voltage-responsive (torque) than 2% of 302 Digital Micro servos |
| Speed Gain per Volt | 11.90%/V More voltage-responsive (speed) than 13% of 305 Digital Micro servos |
| Voltage Range Width | 2.4 V Wider voltage range than 60% of 553 Digital Micro servos |
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