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Technical Specifications
Last Updated: 2026-10-25
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | BLS3837MED |
| Category | Hobby |
| Performance | |
| Torque |
8.4V
513.93 oz-in
37.01 kg-cm
3.6 N-m
7.4V
430.59 oz-in
31.01 kg-cm
3.0 N-m
6.0V
361.14 oz-in
26.00 kg-cm
2.6 N-m
Above Average
|
| 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
0.10 sec/60°
600.0 deg/s
100.0 RPM
Above Average
|
| Physical | |
| Weight | 2.82 oz80.0 gBelow Average |
| Dimensions |
L 1.57 in W 0.79 in H 1.50 in L 39.9 mm W 20.1 mm H 38.1 mm |
| Case Material | Aluminum |
| Drivetrain | |
| Motor Type | Brushless |
| Gears | Steel |
| Gear Spline/Teeth | 25 T |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Digital |
| Rotational Range | 180° |
| Pulse Width | 500-2500 µs |
| Angle Sensor | Magnetic Encoder |
| Control System | PWM |
| Programmable | Yes |
| Electrical & Environment | |
| Operating Voltage | 6–8.4 V |
| Water Rating | Waterproof |
| Connectivity | |
| Connector | JR (Universal) |
| Wire Length | 300 mm11.81 in |
| Origin | |
| Country of Origin | China |
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 79% of 1055 Digital Standard servos at 6.0V |
| Speed | Above Average Faster than 76% of 1038 Digital Standard servos at 6.0V |
| Weight | Below Average Lighter than 10% of 1872 Digital Standard servos |
Performance Analysis
| Shaft Power | 6.68–13.58 W |
| Power Density | 7.297 W/in³ More power-dense than 92% of 1762 Digital Standard servos |
| Torque Density | 4.5143 oz-in/g Stronger than 71% of 1048 Digital Standard servos |
| Torque-to-Volume Ratio | 194.11 oz-in/in³ Denser torque than 81% of 1053 Digital Standard servos |
| Speed-to-Weight | 0.12500 (1/sec·g) Faster than 59% of 1031 Digital Standard servos |
| Speed-Torque Trade-off | 36.11 Better balanced than 59% of 1029 Digital Standard servos |
| Torque Gain per Volt | 17.63%/V More voltage-responsive (torque) than 66% of 868 Digital Standard servos |
| Speed Gain per Volt | 17.85%/V More voltage-responsive (speed) than 64% of 868 Digital Standard servos |
| Voltage Range Width | 2.4 V Wider voltage range than 49% of 1552 Digital Standard servos |
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