Small Ball Castor Wheel – Omnidirectional Caster Wheel for Robot

The Small Ball Castor Wheel is a compact omnidirectional support wheel designed for small mobile robots, robotic cars, DIY platforms, and educational robotics projects. It allows the robot to move freely in multiple directions while providing stable support to the chassis.

Unlike a conventional wheel that primarily moves forward and backward, the ball castor uses a freely rotating stainless steel ball, allowing smooth movement in different directions. It is commonly used as a neutral or supporting wheel in 2-wheel drive (2WD) robotic platforms, where two powered wheels provide motion and the castor wheel supports the remaining side of the chassis.

The castor features a lightweight plastic body with a stainless steel ball. Its compact size makes it particularly suitable for small robotic platforms where space and weight are important considerations.

Three mounting holes positioned approximately 120° apart allow the castor to be securely attached to a robot chassis or base plate.

Features

• Omnidirectional ball castor wheel
• Suitable for small robotic platforms
• 18 mm stainless steel ball
• 304 stainless steel ball material
• Lightweight plastic body
• Compact and lightweight construction
• Allows movement in multiple directions
• Helps provide chassis support and balance
• Three mounting holes for secure installation
• Mounting holes positioned 120° apart
• Suitable for 2WD robot chassis
• Easy to install and use
• Ideal for DIY and educational robotics projects

Specifications

Parameter	Specification
Product Type	Small Ball Castor Wheel
Base Plate Diameter	35 mm
Castor Ball dia With plastic enclosure	18 mm
Overall Height	25 mm
Ball Material	304 Stainless Steel
Body/Case Material	Plastic
Weight	Approx. 15 g
Number of Mounting Holes	3
Mounting Hole Diameter	3.4 mm
Mounting Hole Arrangement	120° apart
Movement Type	Omnidirectional

Applications

The Small Ball Castor Wheel is suitable for:

• 2WD robot cars
• Small mobile robots
• Line follower robots
• Obstacle avoidance robots
• Bluetooth-controlled robots
• Wi-Fi-controlled robotic cars
• Arduino robot projects
• ESP32-based robots
• Raspberry Pi robotic platforms
• Educational robotics kits
• Autonomous mobile robot prototypes
• DIY robotic chassis
• College and school robotics projects

How Does a Ball Castor Wheel Work?

The castor contains a freely rotating ball that acts as the contact point between the robot and the floor. Since the ball can rotate in different directions, it follows the movement generated by the robot’s powered wheels without requiring a separate motor.

For example, in a typical 2WD robot, two DC geared motors are connected to the left and right wheels. The ball castor is mounted at the front or rear of the chassis to provide the third point of support. As the powered wheels move or turn the robot, the castor ball rotates freely according to the direction of movement.

Package Includes

1 × Small Ball Castor Wheel

Product Disclaimer

Product images are for representation purposes only. The actual product may vary slightly in appearance, colour, dimensions, markings, material finish, mounting arrangement, or other minor details depending on the manufacturer, production batch, or availability. These variations do not necessarily affect the intended functionality of the product. Please refer to the product specifications and description before placing your order.

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