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Metal Caster Wheel for Robot-20mm
40.00 EGP
A low-profile, heavy-duty 20mm metal ball caster designed for autonomous robots. Unlike plastic casters, this stainless steel ball provides smooth 360-degree rotation and extreme durability, making it the perfect “third wheel” for Arduino and Raspberry Pi robot chassis. Quality assured by Pro Tronix.
In stock
Metal Caster Wheel for Robot-20mm
Product Overview
The 20mm Metal Ball Caster from Pro Tronix is an essential component for differential-drive robots (robots with two main drive wheels). To maintain balance, these robots require a “caster” wheel that can move in any direction instantly.
While many hobby kits use plastic omni-wheels that can wear down or get stuck, this caster features a high-precision stainless steel ball housed in a metal casing. It provides a low-friction, 360-degree pivot that allows your robot to spin, turn, and reverse without the mechanical resistance found in traditional wheels. Its compact 20mm height makes it ideal for sleek, low-center-of-gravity builds.
Technical Specifications
| Feature | Specification |
| Ball Diameter | 20mm |
| Ball Material | Stainless Steel |
| Housing Material | Carbon Steel / Zinc Plated |
| Mounting Type | 2-Hole Flange |
| Mounting Hole Distance | ~40mm – 45mm |
| Load Capacity | Up to 15kg (per caster) |
| Rotation | 360° Omni-directional |
| Supplier | Pro Tronix |
Key Features
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Omni-Directional Movement: Effortless 360-degree rotation allows for complex maneuvers and zero-turn radius steering.
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All-Metal Durability: The stainless steel ball resists abrasion and can handle much heavier payloads than plastic equivalents.
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Low Friction: Precision housing ensures the ball rolls smoothly on most hard surfaces, reducing the strain on your drive motors.
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Easy Installation: Features a standard flange with two mounting holes, making it easy to bolt onto acrylic, wood, or metal robot chassis.
Common Applications
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Arduino/Raspberry Pi Robots: The ideal front or rear support wheel for 2WD smart car kits.
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Warehouse AGVs: Small-scale automated guided vehicles requiring high load stability.
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Balancing Robots: Providing a safety “kickstand” or support point for self-balancing prototypes.
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Industrial Furniture: Small-scale sliding mechanisms and conveyor “ball tables.”
You can see our available mechanical components from here: Mechanical | Pro Tronix
Shipping & Delivery Policy
At Protronix, we ensure your orders are delivered safely and efficiently through multiple reliable channels tailored to your needs.
Our Delivery Methods
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Egypt Post: Standard shipping to all governorates across Egypt via the National Postal Authority.
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Uber Scooter: Fast, same-day express delivery for local orders within supported urban areas.
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Store Pickup: You can skip the shipping fees by collecting your order directly from our main branch.
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SG90 Micro Servo Motor | 180° Rotation
The world’s most popular micro servo for hobbyists and students. Lightweight, affordable, and incredibly easy to control, the SG90 is the go-to choice for small-scale robotics, camera gimbals, and Arduino-based automation projects. Quality assured by Pro Tronix.
Product Overview
The SG90 Micro Servo from Pro Tronix is a tiny but mighty actuator that has become a staple in the maker community. Weighing only 9 grams, it packs enough punch to move small linkages, open latches, or rotate sensors.
Because it operates on a standard 180-degree rotation, you can precisely control its position to any angle between 0 and 180 degrees using PWM (Pulse Width Modulation). It is designed to work perfectly with the 5V output of an Arduino, ESP32, or Raspberry Pi, making it the ideal entry point for anyone learning about motion control and robotics.
Technical Specifications
Feature Specification Weight 9g Dimensions 22.2mm x 11.8mm x 31mm Stall Torque 1.8 kg-cm (at 4.8V) Operating Speed 0.1 sec/60° (at 4.8V) Operating Voltage 4.8V DC (Max 6V) Gear Type Nylon / Plastic Rotation Range 180° Cable Length 25cm Supplier Pro Tronix Key Features
Ultra-Lightweight: At just 9g, it is perfect for weight-sensitive projects like RC indoor flyers or small walking robots.
Easy to Interface: Comes with a standard 3-pin connector (GND, VCC, Signal) that plugs directly into most sensor shields.
Complete Accessory Kit: Includes 3 different servo horns (arms) and mounting screws to fit various mechanical setups.
Great for Learning: The most supported servo motor in terms of online tutorials, libraries, and 3D-printable designs.
Common Applications
Arduino Starter Projects: Learning how to control movement with sensors (e.g., a radar using an Ultrasonic sensor).
DIY Camera Gimbals: Building a pan-and-tilt mount for small FPV or Pi cameras.
Automatic Pet Feeders: Controlling a small trapdoor or rotating dispenser.
Animated Props: Adding eye or limb movements to Halloween props and artistic installations.
💡 Wiring Tip:
Brown Wire: Ground (GND)
Red Wire: Positive (VCC 4.8V - 5V)
Orange/Yellow Wire: Signal (PWM)
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