TD8120MG 20KG Digital Steering Servo, Metal Gear, Waterproof
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Prices updated: 14 Oct 2026
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About this product
The TD8120MG is a 20 kg digital steering servo with metal gears, double bearings and a waterproof output shaft, operating from 4.8 to 7.2 V. It suits robot arms, RC steering and other projects that need high torque and a durable servo.
Specifications
- Gear material
- Metal
- Bearings
- Double bearing
- Torque
- 18.5 kg·cm at 4.8V; 21.8 kg·cm at 6.0V
- Speed
- 0.18 sec/60° at 4.8V; 0.14 sec/60° at 6.0V
- Supply voltage
- 4.8 - 7.2 VDC
- Connector
- S type (GND, VCC, Signal), 300 mm cable
- Operating temperature
- -30 °C to 60 °C
- Dimensions
- 54.44 x 20 x 40.45 mm
Frequently asked questions
How do I wire it to an Arduino?
The S connector carries GND, VCC and Signal. Connect Signal to a PWM-capable pin, and connect the servo ground to the controller ground. Power VCC from a supply within 4.8-7.2 V rather than the Arduino 5V pin.
Does it need a separate power supply?
Yes for most builds. At high torque the servo can draw a large current when stalled, which the Arduino 5V pin cannot safely supply. Use a dedicated supply rated for the peak current and share ground with the controller.
