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Technical Specifications
Last Updated: 2026-10-27
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | BMS-661MG+HS |
| Category | Hobby |
| Discontinued | Yes |
| Performance | |
| Torque |
6.0V
89.00 oz-in
6.41 kg-cm
0.6 N-m
4.8V
69.00 oz-in
4.97 kg-cm
0.5 N-m
Average
|
| Speed |
6.0V
0.08 sec/60°
750.0 deg/s
125.0 RPM
4.8V
0.11 sec/60°
560.7 deg/s
93.5 RPM
Top 10%
|
| Physical | |
| Weight | 1.73 oz49.0 gAverage |
| Dimensions |
L 1.594 in W 0.787 in H 1.516 in L 40.5 mm W 20.0 mm H 38.5 mm |
| Drivetrain | |
| Motor Type | Coreless |
| Motor Drive | MOS |
| Gears | Metal |
| Gear Spline/Teeth | 25 T estimate |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Analog |
| Rotational Range | 120° |
| Pulse Cycle | 8 ms |
| Neutral Position | 1520 µs |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 4.8–6 V |
| Connectivity | |
| Connector | JR (Universal) |
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 | Average Stronger than 40% of 198 Analog Standard servos at 4.8V |
| Speed | Top 10% Faster than 99% of 195 Analog Standard servos at 4.8V |
| Weight | Average Lighter than 48% of 447 Analog Standard servos |
Performance Analysis
| Shaft Power | 1.19–2.06 W |
| Power Density | 1.082 W/in³ More power-dense than 84% of 432 Analog Standard servos |
| Torque Density | 1.4082 oz-in/g Stronger than 40% of 198 Analog Standard servos |
| Torque-to-Volume Ratio | 36.28 oz-in/in³ Denser torque than 38% of 198 Analog Standard servos |
| Speed-to-Weight | 0.19073 (1/sec·g) Faster than 96% of 195 Analog Standard servos |
| Speed-Torque Trade-off | 7.38 Better balanced than 7% of 195 Analog Standard servos |
| Torque Gain per Volt | 24.15%/V More voltage-responsive (torque) than 92% of 156 Analog Standard servos |
| Speed Gain per Volt | 28.13%/V 2nd-highest speed gain per volt of 156 Analog Standard servos |
| Voltage Range Width | 1.2 V Wider voltage range than 74% of 239 Analog Standard servos |
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