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

Key Features

• Omni-Directional Movement: Effortless 360-degree rotation allows for complex maneuvers and zero-turn radius steering.

• All-Metal Durability: The stainless steel ball resists abrasion and can handle much heavier payloads than plastic equivalents.

• Low Friction: Precision housing ensures the ball rolls smoothly on most hard surfaces, reducing the strain on your drive motors.

• Easy Installation: Features a standard flange with two mounting holes, making it easy to bolt onto acrylic, wood, or metal robot chassis.

Common Applications

• Arduino/Raspberry Pi Robots: The ideal front or rear support wheel for 2WD smart car kits.

• Warehouse AGVs: Small-scale automated guided vehicles requiring high load stability.

• Balancing Robots: Providing a safety “kickstand” or support point for self-balancing prototypes.

• Industrial Furniture: Small-scale sliding mechanisms and conveyor “ball tables.”

You can see our available mechanical components from here: Mechanical | Pro Tronix