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Technical Specifications
Last Updated: 2026-10-22
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | BLS-HV40KG |
| Category | Hobby |
| Performance | |
| Torque |
8.4V
597.16 oz-in
43.00 kg-cm
4.2 N-m
7.4V
555.50 oz-in
40.00 kg-cm
3.9 N-m
6.0V
486.06 oz-in
35.00 kg-cm
3.4 N-m
Above Average
|
| Speed |
8.4V
0.08 sec/60°
750.0 deg/s
125.0 RPM
7.4V
0.09 sec/60°
705.9 deg/s
117.6 RPM
6.0V
0.10 sec/60°
600.0 deg/s
100.0 RPM
Above Average
|
| Physical | |
| Weight | 2.43 oz69.0 gBelow Average |
| Dimensions |
L 1.575 in W 0.787 in H 1.469 in L 40.0 mm W 20.0 mm H 37.3 mm |
| Case Material | Aluminum |
| Drivetrain | |
| Motor Type | Brushless |
| Motor Drive | MOS |
| Gears | Metal |
| Gear Spline/Teeth | 25 T |
| Rotation Mode | Positional |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Digital |
| Rotational Range | 180° |
| Pulse Width | 500-2500 µs |
| Neutral Position | 1500 µs |
| Dead Band | 2 µs |
| Control System | PWM |
| Programmable | No |
| Electrical & Environment | |
| Operating Voltage | 6–8.4 V |
| Temperature | -20–60 °C-4–140 °F |
| Water Rating | IP67 |
| Connectivity | |
| Connector | JR (Universal) |
| Wire Length | 300 mm11.81 in |
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 81% of 22 Unknown servos at 6.0V |
| Speed | Above Average Faster than 73% of 23 Unknown servos at 6.0V |
| Weight | Below Average Lighter than 31% of 65 Digital Unknown servos |
Performance Analysis
| Torque Density | 7.0444 oz-in/g Stronger than 96% of 2582 Hobby servos |
| Torque-to-Volume Ratio | 266.93 oz-in/in³ Denser torque than 95% of 2590 Hobby servos |
| Speed-to-Weight | 0.14493 (1/sec·g) Faster than 41% of 2569 Hobby servos |
| Speed-Torque Trade-off | 48.61 Better balanced than 71% of 22 Unknown servos |
| Torque Gain per Volt | 9.52%/V More voltage-responsive (torque) than 15% of 2097 Hobby servos |
| Speed Gain per Volt | 10.42%/V More voltage-responsive (speed) than 16% of 2115 Hobby servos |
| Voltage Range Width | 2.4 V Wider voltage range than 39% of 34 Digital Unknown servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0010 Finer dead band than 65% of 1058 Hobby servos |
Notes
Comes in a 180 or 270 degree version.
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