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Technical Specifications
Last Updated: 2026-10-23| Identity | |
| Brand |  |
| Product Number | KST-BLS825 |
| Category | Hobby |
| Performance | |
| Torque |
8.4V
485.80 oz-in
34.98 kg-cm
3.4 N-m
7.4V
416.40 oz-in
29.98 kg-cm
2.9 N-m
6.0V
347.00 oz-in
24.99 kg-cm
2.5 N-m
Above Average
|
| Speed |
8.4V
0.11 sec/60°
545.5 deg/s
90.9 RPM
7.4V
0.13 sec/60°
461.5 deg/s
76.9 RPM
6.0V
0.15 sec/60°
400.0 deg/s
66.7 RPM
Average
|
| Physical | |
| Weight | 2.47 oz70.0 gAverage |
| Dimensions |
L 1.595 in W 0.787 in H 1.496 in L 40.5 mm W 20.0 mm H 38.0 mm |
| Case Material | Aluminum |
| Drivetrain | |
| Motor Type | Brushless |
| Gears | Steel |
| Gear Spline/Teeth | 25 T estimate |
| Rotation Mode | Positional |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Digital |
| Rotational Range | 120° |
| Pulse Cycle | 3.003 ms |
| Pulse Width | 900-2100 µs |
| Neutral Position | 1500 µs |
| Refresh Rate | 333 Hz |
| Angle Sensor | Potentiometer |
| Control System | PWM |
| Programmable | Yes |
| Signal Voltage | 3-5V |
| Electrical & Environment | |
| Operating Voltage | 6–8.4 V |
| Temperature | -20–65 °C-4–149 °F |
| 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 | Above Average Stronger than 76% of 1055 Digital Standard servos at 6.0V |
| Speed | Average Faster than 42% of 1038 Digital Standard servos at 6.0V |
| Weight | Average Lighter than 35% of 1872 Digital Standard servos |
Performance Analysis
| Shaft Power | 4.28–8.17 W |
| Power Density | 4.347 W/in³ More power-dense than 74% of 1762 Digital Standard servos |
| Torque Density | 4.9571 oz-in/g Stronger than 77% of 1048 Digital Standard servos |
| Torque-to-Volume Ratio | 184.74 oz-in/in³ Denser torque than 78% of 1053 Digital Standard servos |
| Speed-to-Weight | 0.09524 (1/sec·g) Faster than 31% of 1031 Digital Standard servos |
| Speed-Torque Trade-off | 52.05 Better balanced than 77% of 1029 Digital Standard servos |
| Torque Gain per Volt | 16.67%/V More voltage-responsive (torque) than 58% of 868 Digital Standard servos |
| Speed Gain per Volt | 15.16%/V More voltage-responsive (speed) than 47% of 868 Digital Standard servos |
| Voltage Range Width | 2.4 V Wider voltage range than 58% of 1552 Digital Standard servos |
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Reviews (1)
Includes 1 review aggregated from around the web.
Owners, mostly large-scale and aerobatic airplane flyers, are very happy with this servo. One flyer has more than 25 in use and says he has never had problems, calling them very precise and strong though not extremely fast, and another has fitted a large number across several planes. A buyer who tested a batch on the bench found them quiet, with less gear play than a comparable popular brand. The one quirk mentioned is an occasional jitter at neutral, which owners say is easy to fix or avoided with smaller deflections. Forum posters describe its reputation as consistently positive, though only a handful of detailed reports were found.
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