DS3218 20KG High-Torque 270° Digital Metal Gear Servo Motor (Waterproof with Metal Servo Horn)

Power high-load robotics and RC projects with the DS3218 20KG 270-Degree Digital Servo Motor. Delivering an impressive torque of up to 20 kg.cm at 6.8V, this high-performance servo features full copper-aluminum precision metal gears, dual ball bearings, and a CNC aluminum middle case for efficient heat dissipation. Offering an extended 270° rotation angle, digital control response, and IP66 splash-proof water resistance, it is designed for demanding applications in robotic arms, bipedal walkers, 1/8 and 1/10 scale RC crawlers, and Arduino automation projects.

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₹ 1,325 ^{₹ 1,599}

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Tags DS3218 20kg Servo 270 Degree Servo Motor DS3218 Digital Servo Metal Gear Servo 20kg High Torque Arduino Servo Waterproof Servo Motor Robotic Arm Servo 1/10 RC Crawler Servo

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Product Details :

The DS3218 20KG 270° Digital Servo Motor is a robust, heavy-duty mechanical actuator engineered for demanding projects that require high holding force and precise wide-angle positioning. Unlike standard $180^circ$ servos or weak plastic-geared alternatives, the DS3218 houses a set of precision-cut copper and aluminum metal gears mounted on dual ball bearings, preventing gear stripping under sudden impact or high stalls.

Encased in a hybrid structure featuring a CNC aluminum middle shell for accelerated heat dissipation, this motor delivers continuous reliability without thermal fading during extended operation. Its IP66-rated water and dust-resistant casing ensures smooth operation in wet or dusty outdoor environments, making it a favorite for 1/8 and 1/10 scale RC crawlers, custom robotic grippers, pan-tilt gimbals, and automated steering assemblies.

Key Features and Benefits

High Torque Performance: Generates up to $20 ext{ kg}cdot ext{cm}$ of stall torque at $6.8 ext{V}$ , providing ample power for heavy-duty lifting and steering.
Extended 270° Rotation: Provides an expanded motion range ( $0^circ ext{ to } 270^circ$ ) controlled via standard PWM signals, ideal for robotic arms and complex linkage mechanisms.
Full Metal Gear Train: Hard-anodized copper and aluminum internal gears deliver superior wear resistance and long operating life under shock loads.
Aluminum Core Heat Sink: CNC-machined middle casing quickly dissipates heat generated by the core motor during continuous heavy loads.
IP66 Water Resistance: Rubber seals protect internal potentiometers and control circuit boards from water splashes, rain, and humidity.
Digital Controller Logic: High-speed digital processing guarantees rapid response times, low dead-band ( $le 3 mu ext{s}$ ), and high positioning accuracy.

Technical Specifications

Feature Component	Specification Details
Model Designation	DS3218 (270° Version)
Control System	Pulse Width Modulation (PWM) Digital Control
Operating Angle	$270^circ pm 3^circ$ (Pulse range: $500 - 2500 mu ext{s}$ )
Operating Voltage Range	$4.8 ext{V} - 6.8 ext{V DC}$
Stall Torque ( $5.0 ext{V}$ )	$19.0 ext{ kg}cdot ext{cm}$ ( $263.8 ext{ oz/in}$ )
Stall Torque ( $6.8 ext{V}$ )	$21.5 ext{ kg}cdot ext{cm}$ ( $298.5 ext{ oz/in}$ )
Operating Speed ( $5.0 ext{V}$ )	$0.16 ext{ sec}/60^circ$
Operating Speed ( $6.8 ext{V}$ )	$0.14 ext{ sec}/60^circ$
Gear Material	Precision Copper & Aluminum Alloy
Dead-Band Width	$3 mu ext{s}$
Motor Type / Bearing	Core DC Motor / Dual Ball Bearings
Water Resistance Rating	IP66 (Splash-proof)

Pinout & Wiring Guide

The servo comes with a standard 3-pin 0.1" ( $2.54 ext{mm}$ ) female connector compatible with Arduino shield servo ports and RC receivers:

3-Pin Wire Color Code:

Brown / Black Wire (GND): Power Supply Ground ( $0 ext{V}$ ). Must be tied to the microcontroller common ground.
Red Wire ( $V_{CC}$ ): Power Supply Positive ( $+5.0 ext{V}$ to $+6.8 ext{V DC}$ ).
Orange / Yellow Wire (Signal): PWM Input Signal line (Connect to Arduino digital PWM pin).

Power Supply Note: Do NOT power this high-torque servo directly from the Arduino $5 ext{V}$ pin. A $20 ext{kg}$ servo can draw up to $2.0 ext{A}-2.5 ext{A}$ during heavy stalls, which will reset or damage the microcontroller. Always use an external regulated $5 ext{V}-6.8 ext{V}$ ( $3 ext{A}+$ rated) power supply and connect its ground pin to the Arduino ground pin.

Arduino Quick-Start Code Example

To achieve the full $270^circ$ movement range with standard Arduino libraries, pass custom minimum and maximum pulse widths ( $500 mu ext{s}$ to $2500 mu ext{s}$ ) when attaching the pin:

C++
#include <Servo.h>

Servo myServo;  // Create servo object

const int SERVO_PIN = 9; // Connect to Signal (Orange) wire

void setup() {
  Serial.begin(9600);
  // Attach servo to pin 9 with pulse range: 500us (0 deg) to 2500us (270 deg)
  myServo.attach(SERVO_PIN, 500, 2500); 
  Serial.println("DS3218 270-Degree Servo Initialized.");
}

void loop() {
  // Move to 0 Degrees
  myServo.write(0);
  delay(1500);

  // Move to Midpoint (135 Degrees)
  myServo.write(135);
  delay(1500);

  // Move to Max Position (270 Degrees)
  myServo.write(270);
  delay(1500);
}

Applications

Robotics & Manipulators: Joints for multi-DOF robotic arms, humanoid bipedal legs, and high-load mechanical grippers.
RC Vehicles: Heavy-duty steering servos for 1/8 and 1/10 scale RC rock crawlers, off-road buggies, and monster trucks.
Pan-Tilt Gimbals: Smooth, high-load camera positioning and long-range tracking mounts.
Industrial Automation: Automated valve control, heavy latch opening, and custom linear actuator conversions.