Discover XQ-Power Servos in Our eBay Store!
Shop Now
Technical Specifications
Last Updated: 2026-10-09
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 gBottom 10% |
| 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 |
| 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 95% of 328 Digital Micro servos at 6.0V |
| Speed | Above Average Faster than 71% of 328 Digital Micro servos at 6.0V |
| Weight | Bottom 10% Lighter than 9% of 620 Digital Micro servos |
Performance Analysis
| Shaft Power | 2.14–3.12 W |
| Power Density | 5.456 W/in³ More power-dense than 82% of 590 Digital Micro servos |
| Torque Density | 4.9571 oz-in/g Stronger than 94% of 327 Digital Micro servos |
| Torque-to-Volume Ratio | 182.25 oz-in/in³ Denser torque than 91% of 327 Digital Micro servos |
| Speed-to-Weight | 0.52910 (1/sec·g) Faster than 21% of 327 Digital Micro servos |
| Speed-Torque Trade-off | 9.37 Better balanced than 90% of 327 Digital Micro servos |
| Torque Gain per Volt | 5.56%/V More voltage-responsive (torque) than 2% of 268 Digital Micro servos |
| Speed Gain per Volt | 11.90%/V More voltage-responsive (speed) than 15% of 273 Digital Micro servos |
| Voltage Range Width | 2.4 V Wider voltage range than 58% of 511 Digital Micro servos |
Similar Active Servos
Reviews of KST BLS88WP
Be the first to review!