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Technical Specifications
Last Updated: 2026-10-10
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | OMG-ST-40BF |
| Category | Hobby |
| Performance | |
| Torque |
8.4V
556.00 oz-in
40.04 kg-cm
3.9 N-m
7.4V
528.00 oz-in
38.02 kg-cm
3.7 N-m
Top 10%
|
| Speed |
8.4V
0.07 sec/60°
923.1 deg/s
153.8 RPM
7.4V
0.08 sec/60°
769.2 deg/s
128.2 RPM
Above Average
|
| Physical | |
| Weight | 2.79 oz79.0 gBelow Average |
| Dimensions |
L 1.57 in W 0.79 in H 1.50 in L 39.9 mm W 20.1 mm H 38.1 mm |
| Case Material | Metal |
| Drivetrain | |
| Motor Type | Brushless |
| Gears | Stainless Steel |
| Gear Spline/Teeth | 25 T |
| Rotation Mode | Positional |
| Rotation/Support | Triple Bearings |
| Control & Signal | |
| Modulation | Digital |
| Rotational Range | 180° |
| Mechanical Limit | 180° |
| Pulse Width | 500-2500 µs |
| Neutral Position | 1520 µs |
| Dead Band | 2 µs |
| Refresh Rate | 333 Hz |
| Programmable | Yes |
| Electrical & Environment | |
| Operating Voltage | 7.4–8.4 V |
| Temperature | -15–70 °C5–158 °F |
| Water Rating | IP67 |
| Connectivity | |
| Wire Length | 300 mm11.81 in |
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 93% of 1043 Digital Standard servos at 7.4V |
| Speed | Above Average Faster than 89% of 1041 Digital Standard servos at 7.4V |
| Weight | Below Average Lighter than 12% of 1902 Digital Standard servos |
Performance Analysis
| Shaft Power | 12.52–15.82 W |
| Power Density | 8.501 W/in³ More power-dense than 95% of 1759 Digital Standard servos |
| Torque Density | 6.6835 oz-in/g Stronger than 91% of 1036 Digital Standard servos |
| Torque-to-Volume Ratio | 283.80 oz-in/in³ Denser torque than 93% of 1042 Digital Standard servos |
| Speed-to-Weight | 0.16229 (1/sec·g) Faster than 76% of 1033 Digital Standard servos |
| Speed-Torque Trade-off | 41.19 Better balanced than 66% of 1031 Digital Standard servos |
| Torque Gain per Volt | 5.30%/V More voltage-responsive (torque) than 4% of 850 Digital Standard servos |
| Speed Gain per Volt | 20.01%/V More voltage-responsive (speed) than 78% of 871 Digital Standard servos |
| Voltage Range Width | 1.0 V Wider voltage range than 3% of 1539 Digital Standard servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0010 Finer dead band than 68% of 468 Digital Standard servos |
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