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Technical Specifications
Last Updated: 2026-10-26
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | BLS0521THV |
| Category | Hobby |
| Performance | |
| Torque |
8.4V
116.68 oz-in
8.40 kg-cm
0.8 N-m
7.4V
102.79 oz-in
7.40 kg-cm
0.7 N-m
6.0V
83.34 oz-in
6.00 kg-cm
0.6 N-m
Below Average
|
| Speed |
8.4V
0.03 sec/60°
2,000.0 deg/s
333.3 RPM
7.4V
0.03 sec/60°
2,000.0 deg/s
333.3 RPM
6.0V
0.04 sec/60°
1,500.0 deg/s
250.0 RPM
Top 10%
|
| Physical | |
| Weight | 2.47 oz70.0 gBelow Average |
| Dimensions |
L 1.46 in W 0.79 in H 1.57 in L 37.1 mm W 20.1 mm H 39.9 mm |
| Case Material | Aluminum |
| Drivetrain | |
| Motor Type | Brushless |
| Gears | Metal |
| Control & Signal | |
| Modulation | Digital |
| Neutral Position | 760 µs |
| Refresh Rate | 333 Hz |
| Electrical & Environment | |
| Operating Voltage | 6–8.4 V |
| Connectivity | |
| Connector | JR (Universal) estimate |
| 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 | Below Average Stronger than 13% of 1060 Digital Standard servos at 6.0V |
| Speed | Top 10% Faster than 99% of 1045 Digital Standard servos at 6.0V |
| Weight | Below Average Lighter than 34% of 1880 Digital Standard servos |
Performance Analysis
| Shaft Power | 3.85–7.19 W |
| Power Density | 3.971 W/in³ More power-dense than 71% of 1768 Digital Standard servos |
| Torque Density | 1.1906 oz-in/g Stronger than 6% of 1053 Digital Standard servos |
| Torque-to-Volume Ratio | 46.02 oz-in/in³ Denser torque than 12% of 1058 Digital Standard servos |
| Speed-to-Weight | 0.35714 (1/sec·g) Faster than 98% of 1038 Digital Standard servos |
| Speed-Torque Trade-off | 3.33 Better balanced than 3% of 1034 Digital Standard servos |
| Torque Gain per Volt | 16.67%/V More voltage-responsive (torque) than 59% of 873 Digital Standard servos |
| Speed Gain per Volt | 13.89%/V More voltage-responsive (speed) than 39% of 874 Digital Standard servos |
| Voltage Range Width | 2.4 V Wider voltage range than 48% of 1560 Digital Standard servos |
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