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Technical Specifications
Last Updated: 2026-10-26
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | BMS-A12H |
| Category | Hobby |
| Performance | |
| Torque |
8.4V
63.89 oz-in
4.60 kg-cm
0.5 N-m
7.4V
58.34 oz-in
4.20 kg-cm
0.4 N-m
6.0V
51.39 oz-in
3.70 kg-cm
0.4 N-m
3.7V
31.95 oz-in
2.30 kg-cm
0.2 N-m
|
| Speed |
8.4V
0.09 sec/60°
666.7 deg/s
111.1 RPM
7.4V
0.10 sec/60°
600.0 deg/s
100.0 RPM
6.0V
0.12 sec/60°
500.0 deg/s
83.3 RPM
3.7V
0.19 sec/60°
315.8 deg/s
52.6 RPM
|
| Physical | |
| Weight | 0.30 oz8.4 gAbove Average |
| Dimensions |
L 0.866 in W 0.315 in H 0.76 in L 22.0 mm W 8.0 mm H 19.3 mm |
| Case Material | Aluminum |
| Drivetrain | |
| Motor Type | Coreless |
| Gears | Stainless Steel |
| Gear Spline/Teeth | 19 T |
| Rotation Mode | Positional |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Digital |
| Direction | Clockwise |
| Rotational Range | 90° |
| Mechanical Limit | 90° |
| Pulse Cycle | 3 ms |
| Pulse Width | 1100-1900 µs |
| Neutral Position | 1500 µs |
| Dead Band | 2 µs |
| Refresh Rate | 333 Hz |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 3.6–8.4 V |
| Power Source | 2S Li-Po / 2S Li-Fe |
| Connectivity | |
| Connector | JR (Universal) |
| Wire Length | 150 mm5.91 in |
| 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 72% of 597 Digital Micro servos |
Performance Analysis
| Shaft Power | 0.31–1.31 W |
| Power Density | 6.331 W/in³ More power-dense than 88% of 563 Digital Micro servos |
| Torque Density | 3.8036 oz-in/g |
| Torque-to-Volume Ratio | 154.11 oz-in/in³ |
| Speed-to-Weight | 0.62657 (1/sec·g) |
| Speed-Torque Trade-off | 6.07 |
| Voltage Range Width | 4.8 V Wider voltage range than 98% of 496 Digital Micro servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0025 Finer dead band than 20% of 182 Digital Micro servos |
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