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Technical Specifications
Last Updated: 2026-10-25
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | BLS4058RP |
| Category | Hobby |
| Performance | |
| Torque |
8.4V
805.62 oz-in
58.01 kg-cm
5.7 N-m
7.4V
680.61 oz-in
49.01 kg-cm
4.8 N-m
6.0V
583.38 oz-in
42.01 kg-cm
4.1 N-m
Top 10%
|
| Speed |
8.4V
0.12 sec/60°
500.0 deg/s
83.3 RPM
7.4V
0.14 sec/60°
428.6 deg/s
71.4 RPM
6.0V
0.17 sec/60°
352.9 deg/s
58.8 RPM
Below Average
|
| Physical | |
| Weight | 2.82 oz80.0 gBottom 10% |
| Dimensions |
L 1.57 in W 0.79 in H 1.59 in L 39.9 mm W 20.1 mm H 40.4 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 | Top 10% Stronger than 95% of 1055 Digital Standard servos at 6.0V |
| Speed | Below Average Faster than 25% of 1038 Digital Standard servos at 6.0V |
| Weight | Bottom 10% Lighter than 10% of 1872 Digital Standard servos |
Performance Analysis
| Shaft Power | 6.35–12.41 W |
| Power Density | 6.295 W/in³ More power-dense than 86% of 1762 Digital Standard servos |
| Torque Density | 7.2923 oz-in/g Stronger than 95% of 1048 Digital Standard servos |
| Torque-to-Volume Ratio | 295.82 oz-in/in³ Denser torque than 95% of 1053 Digital Standard servos |
| Speed-to-Weight | 0.07353 (1/sec·g) Faster than 9% of 1031 Digital Standard servos |
| Speed-Torque Trade-off | 99.19 Better balanced than 96% of 1029 Digital Standard servos |
| Torque Gain per Volt | 15.87%/V More voltage-responsive (torque) than 51% of 868 Digital Standard servos |
| Speed Gain per Volt | 17.37%/V More voltage-responsive (speed) than 61% 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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