The TD-8120MG 20KG Digital Servo Motor is a high-torque digital servo designed for robotics, RC vehicles, mechanical control systems, and DIY automation projects.
Featuring durable metal gears, 180° positioning capability, and a rated torque of up to 20 kg·cm, this servo provides controlled angular movement for applications requiring strength and positioning accuracy.
The servo operates from a 4.8V–6.6V DC power supply and can be controlled using standard servo PWM signals from Arduino, ESP32, Raspberry Pi, and compatible servo controllers.
Its water-resistant design and included mounting accessories make it suitable for a variety of robotics and RC applications.
Key Features
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High Torque: Rated up to 20 kg·cm.
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180° Rotation: Designed for angular position control.
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Digital Servo Control: Supports precise positioning using PWM control signals.
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Metal Gear Construction: Provides improved mechanical durability.
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Water-Resistant Design: Intended for applications where moisture resistance is beneficial.
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Wide Operating Voltage: 4.8V–6.6V DC.
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Standard 3-Wire Interface: Compatible with common servo controllers.
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Mounting Accessories: Servo horns and mounting hardware shown with the product.
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Robotics Compatible: Suitable for Arduino, ESP32, Raspberry Pi, and other development platforms.
Technical Specifications
| Parameter |
Specification |
| Model |
TD-8120MG |
| Product Type |
Digital Servo Motor |
| Rated Torque |
Up to 20 kg·cm |
| Rotation Angle |
180° |
| Operating Voltage |
4.8V–6.6V DC |
| Gear Material |
Metal |
| Control Interface |
Servo PWM |
| Motor Control |
Digital Position Control |
| Connector |
3-Wire Servo Connector |
| Water Resistance |
Water-resistant design (IP rating not specified) |
| Mounting |
Servo Horn and Mounting Screws |
Note: Torque depends on operating voltage and load conditions. Stall current, operating speed, dead-band width, and exact torque test voltage have not been confirmed.
Pin Configuration
| Wire Color |
Function |
| Brown / Black |
GND – Ground |
| Red |
VCC – Positive Power Supply |
| Orange / Yellow / White |
PWM – Control Signal |
Wire colors may vary between production batches. Verify the actual servo wiring before connecting.
Arduino Connection Example
| Servo Motor |
Arduino Uno |
| Signal |
D9 |
| VCC |
External 5V–6V Supply |
| GND |
External Supply GND and Arduino GND |
The servo can be controlled using the Arduino Servo library to position the output shaft within its supported angular range.
ESP32 Compatibility
The TD-8120MG can be controlled using an ESP32 with a suitable servo PWM signal.
- Connect the servo signal wire to a PWM-capable ESP32 GPIO.
- Use a separate regulated 5V–6V power supply.
- Connect the servo ground and ESP32 ground together.
- Use a power supply capable of handling the servo's peak current.
- Verify that the servo reliably recognizes the ESP32's 3.3V control signal.
Important: Do not power this high-torque servo directly from an Arduino or ESP32 GPIO pin.
Applications
- Robotic Arms and Grippers
- RC Cars and Trucks
- Robotic Steering Systems
- Pan-and-Tilt Mechanisms
- Mechanical Positioning Systems
- DIY Automation Projects
- Educational Robotics
- Remote-Controlled Mechanisms
- Arduino and ESP32 Projects
Important Notes
-
This is a 180° positional servo, not a continuous-rotation motor.
- Do not force the output shaft beyond its mechanical rotation limits.
- The 20 kg·cm rating represents torque, not a 20 kg lifting capacity.
- Use a suitable external power supply for high-load applications.
- Avoid prolonged operation under stall conditions to prevent overheating.
- Water resistance does not mean the servo is suitable for continuous underwater operation.
- Check the required torque, mounting dimensions, and power supply capacity before installation.
Package Includes
- 1 × TD-8120MG Digital Servo Motor
- Servo Horn Accessories
- Mounting Screws and Hardware
