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Technical Specifications
Last Updated: 2026-10-31
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | FT-870B-C001 |
| Category | Hobby |
| Performance | |
| Torque |
8.4V
1,041.75 oz-in
75.01 kg-cm
7.4 N-m
7.4V
973.81 oz-in
70.12 kg-cm
6.9 N-m
|
| Speed |
8.4V
0.14 sec/60°
422.5 deg/s
70.4 RPM
7.4V
0.17 sec/60°
359.3 deg/s
59.9 RPM
|
| Running Current |
8.4V
0.500 A
500 mA
7.4V
0.400 A
400 mA
|
| Stall Current | 7.2–7.8 A7200–7800 mABottom 10% |
| Physical | |
| Weight | 2.78 oz78.8 gBelow Average |
| Dimensions |
L 1.575 in W 0.787 in H 1.535 in L 40.0 mm W 20.0 mm H 39.0 mm |
| Case Material | Aluminum |
| Drivetrain | |
| Motor Type | Brushless |
| Gears | Titanium |
| Gear Spline/Teeth | 25 T estimate |
| Shaft Size | 5.9 mm |
| Rotation Mode | Positional |
| Rotation/Support | Single Bearing |
| Backlash | 0.500° |
| Control & Signal | |
| Modulation | Digital |
| Direction | Counterclockwise |
| Rotational Range | 180° |
| Mechanical Limit | No Limit |
| Pulse Cycle | 20 ms |
| Pulse Width | 500-2500 µs |
| Neutral Position | 1500 µs |
| Dead Band | 4 µs |
| Refresh Rate | 50 Hz |
| Angle Sensor | Potentiometer |
| Control System | PWM |
| Signal Voltage | 2-5V |
| Electrical & Environment | |
| Operating Voltage | 6–9 V |
| Temperature | -20–60 °C-4–140 °F |
| Water Rating | IP65 |
| Certification | RoHS |
| Idle Current | 0.026 A26 mA |
| Connectivity | |
| Connector | JR (Universal) |
| Wire Length | 300 mm11.81 in |
| Origin | |
| Country of Origin | China |
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 | Below Average Lighter than 15% of 1880 Digital Standard servos |
| Stall Current | Bottom 10% Lower draw than 8% of 570 Digital Standard servos |
Performance Analysis
| Shaft Power | 10.78–13.56 W |
| Power Density | 7.129 W/in³ More power-dense than 91% of 1768 Digital Standard servos |
| Torque Density | 12.3580 oz-in/g |
| Torque-to-Volume Ratio | 511.81 oz-in/in³ |
| Speed-to-Weight | 0.07599 (1/sec·g) |
| Speed-Torque Trade-off | 162.62 |
| Current-per-Torque Ratio | 0.0080 A/oz-in |
| Idle-to-Running Current Ratio | 0.065 |
| No-Load vs Stall Current Spread | 19.50 |
| Voltage Range Width | 3.0 V Wider voltage range than 68% of 1560 Digital Standard servos |
| Backlash-to-Range Ratio | 0.00278 Tighter backlash than 65% of 52 Digital Standard servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0020 Finer dead band than 30% of 504 Digital Standard servos |
Notes
Also known as the FT870BL. Case color may also come in black.
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