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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
