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Technical Specifications
Last Updated: 2026-10-22
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | BMS-621 |
| Category | Hobby |
| Performance | |
| Torque |
6.0V
100.00 oz-in
7.20 kg-cm
0.7 N-m
4.8V
89.00 oz-in
6.41 kg-cm
0.6 N-m
|
| Speed |
6.0V
0.10 sec/60°
600.0 deg/s
100.0 RPM
4.8V
0.13 sec/60°
461.5 deg/s
76.9 RPM
|
| Physical | |
| Weight | 1.52 oz43.0 gAbove Average |
| Dimensions |
L 1.594 in W 0.787 in H 1.496 in L 40.5 mm W 20.0 mm H 38.0 mm |
| Drivetrain | |
| Gears | Plastic |
| Gear Spline/Teeth | 25 T estimate |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Analog |
| Pulse Cycle | 8 ms |
| Neutral Position | 1520 µs |
| Refresh Rate | 125 Hz |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 4.5–6.5 V |
| Power Source | Ni-MH / Ni-CD |
| Connectivity | |
| Connector | JR (Universal) |
| Origin | |
| Country of Origin | Taiwan |
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
| Weight | Above Average Lighter than 74% of 447 Analog Standard servos |
Performance Analysis
| Shaft Power | 1.27–1.85 W |
| Power Density | 0.985 W/in³ More power-dense than 78% of 432 Analog Standard servos |
| Torque Density | 2.0698 oz-in/g |
| Torque-to-Volume Ratio | 47.42 oz-in/in³ |
| Speed-to-Weight | 0.17889 (1/sec·g) |
| Speed-Torque Trade-off | 11.57 |
| Voltage Range Width | 2.0 V Wider voltage range than 90% of 239 Analog Standard servos |
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Reviews (2)
Includes 2 reviews aggregated from around the web.
There are very few reviews for this servo on the web. A German forum member who uses it for steering says he is very satisfied, calling it fast and reliable, and says it has survived several heavy crashes without trouble.
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