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Technical Specifications
Last Updated: 2026-10-09
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | BH815S |
| Category | Hobby |
| Performance | |
| Torque |
8.4V
208.30 oz-in
15.00 kg-cm
1.5 N-m
7.4V
180.50 oz-in
13.00 kg-cm
1.3 N-m
6.0V
138.80 oz-in
9.99 kg-cm
1.0 N-m
Average
|
| Speed |
8.4V
0.05 sec/60°
1,200.0 deg/s
200.0 RPM
7.4V
0.06 sec/60°
1,090.9 deg/s
181.8 RPM
6.0V
0.07 sec/60°
923.1 deg/s
153.8 RPM
Top 10%
|
| Running Current |
8.4V
0.400 A
400 mA
7.4V
0.300 A
300 mA
6.0V
0.200 A
200 mA
Above Average
|
| Stall Current | 2.6–3.1 A2600–3100 mAAverage |
| Physical | |
| Weight | 1.83 oz52.0 gAverage |
| Dimensions |
L 1.61 in W 0.79 in H 1.04 in L 40.9 mm W 20.1 mm H 26.4 mm |
| Case Material | Aluminum |
| Drivetrain | |
| Motor Type | Brushless |
| Gears | Titanium |
| Gear Spline/Teeth | 25 T estimate |
| Rotation Mode | Positional |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Digital |
| Rotational Range | 180° |
| Mechanical Limit | 180° |
| Pulse Cycle | 3.03 ms |
| Pulse Width | 800-2200 µs |
| Neutral Position | 1500 µs |
| Dead Band | 2 µs |
| Refresh Rate | 330 Hz |
| Angle Sensor | Potentiometer |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 6–8.4 V |
| Temperature | -10–60 °C14–140 °F |
| Idle Current | 0.009 A9 mA |
| Connectivity | |
| Connector | JR (Universal) |
| Wire Length | 180 mm7.09 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 | Average Stronger than 41% of 136 Digital Low Profile servos at 6.0V |
| Speed | Top 10% Faster than 92% of 135 Digital Low Profile servos at 6.0V |
| Weight | Average Lighter than 46% of 251 Digital Low Profile servos |
| Running Current | Above Average Lower draw than 65% of 21 Digital Low Profile servos at 6.0V |
| Stall Current | Average Lower draw than 60% of 64 Digital Low Profile servos |
Performance Analysis
| Shaft Power | 3.95–7.70 W |
| Power Density | 5.823 W/in³ More power-dense than 75% of 215 Digital Low Profile servos |
| Torque Density | 2.6692 oz-in/g Stronger than 46% of 136 Digital Low Profile servos |
| Torque-to-Volume Ratio | 104.93 oz-in/in³ Denser torque than 55% of 136 Digital Low Profile servos |
| Speed-to-Weight | 0.29586 (1/sec·g) Faster than 89% of 135 Digital Low Profile servos |
| Speed-Torque Trade-off | 9.02 Better balanced than 25% of 134 Digital Low Profile servos |
| Current-per-Torque Ratio | 0.0223 A/oz-in More efficient than 41% of 40 Digital Low Profile servos |
| Idle-to-Running Current Ratio | 0.045 Lower idle draw than 55% of 257 Hobby servos |
| No-Load vs Stall Current Spread | 15.50 Narrower current spread than 38% of 282 Hobby servos |
| Torque Gain per Volt | 20.86%/V More voltage-responsive (torque) than 81% of 115 Digital Low Profile servos |
| Speed Gain per Volt | 12.50%/V More voltage-responsive (speed) than 43% of 117 Digital Low Profile servos |
| Voltage Range Width | 2.4 V Wider voltage range than 39% of 223 Digital Low Profile servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0014 Finer dead band than 64% of 60 Digital Low Profile servos |
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Weight: 53 grams
Dimensions: 1.61" x 0.79" x 1.04"
Size Class: Low Profile
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