DS3218 20KG Metal Gear Servo Motor

The DS3218 20KG Servo Motor is a digital positioning servo for projects that need to move a joint or linkage to a set angle. Use it to position a robotic arm joint, open and close a gripper, or move an RC steering linkage. Its metal gear train transfers motion from the motor to the output shaft.

Metal Gears and Stall Torque

The 20KG label refers to the servo’s torque class. The manufacturer lists stall torque of 18 kg·cm at 5V and 21.5 kg·cm at 6.8V. Stall torque is measured with the shaft locked, so use a lower working load when sizing a robotic arm or steering linkage. A longer servo arm requires more torque to move the same load.

PWM Control and Rotation Options

The servo uses the width of a control pulse to set its position. The manufacturer lists a 500–2,500 µs pulse range and a 1,500 µs centre position. The DS3218 comes in 180° and 270° versions. Confirm which version you’re buying and set the travel limits so the servo does not push against the end stops of your mechanism.

Power Supply and Controller Compatibility

Use a regulated servo power supply that can handle the motor’s current demand. The manufacturer lists a stall current of 1.8A at 5V and 2.2A at 6.8V. For an Arduino or ESP32 project, power the servo from a separate supply, connect the controller and servo grounds, and use the controller to send the position signal.

Product Specifications

Buy DS3218 20KG Servo Motor in Pakistan

Shop the DS3218 20KG Servo Motor at Mekatroniks for robotic arms, grippers and RC steering projects. Match the rotation version to your mechanism and choose a regulated power supply with enough current for the servo.