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  • Writer's pictureRybro Castors

Mastering Castors and Wheels: A Comprehensive Guide to Terminology and Features

Updated: Mar 25

how to measure a castor

how to measuring a wheel

Castors and wheels are the unsung heroes of industrial and material handling equipment, providing mobility, support, and efficiency in various applications. Understanding the terminology and features associated with castors and wheels is essential for selecting the right components to optimise performance and safety. In this guide, we'll delve into the details of castors and wheels terminology, exploring key concepts and features to help you make informed decisions for your specific needs.


1. Axle:

The axle is a critical component that passes through the centre of the wheel, enabling it to rotate smoothly. It provides stability and support while allowing the wheel to rotate freely, facilitating movement and manoeuvrability.


2. Bore:

The bore refers to the inner dimension of the blank wheel or bearing. It determines the fit and compatibility of the wheel with the axle or mounting hardware. Different bore sizes accommodate various axle diameters, ensuring proper alignment and functionality.


- Plain Bore: A wheel bore that rides directly on the axle without the use of bearings. It provides a simple and cost-effective solution for basic applications.


3. Axle Nut:

The axle nut is a fastening device located on the side of the leg, securing the thrust washers, spanner bushings, and bolt or lube axles together. It ensures the stability and integrity of the wheel assembly, preventing loosening or disengagement during operation.


4. Hub Length:

Hub length is the distance from one side of the wheel hub to the other. It determines the stability and load-bearing capacity of the wheel, ensuring proper alignment and support for the equipment.


5. Dynamic or Rolling Load:

The dynamic or rolling load capacity of a castor or wheel refers to the maximum weight it can support while in motion. It takes into account factors such as speed, surface conditions, and frequency of use, ensuring safe and reliable operation under dynamic loading conditions.


6. Swivel Radius:

Swivel radius is the horizontal distance from the centerline of the castor kingpin to the outer edge of the wheel. It influences the turning radius and manoeuvrability of equipment equipped with swivel castors, allowing for smooth and precise navigation in tight spaces.


7. Wheel Diameter:

Wheel diameter is the measurement of a wheel from opposite sides, determining its load-bearing capacity, stability, and rolling characteristics. Larger wheel diameters offer higher load capacities and smoother rolling motion, making them suitable for heavy-duty applications.


8. Plate Dimension:

Plate dimension refers to the measured distance from one edge of the top plate to the opposite side and the distance from the other edge of the top plate to the opposite side. It specifies the mounting dimensions of the castor plate, ensuring proper fit and compatibility with the equipment.


9. Hole Centres

Hole centres refers to the measured distance from the centre of one hole to the next on the mounting plate. It specifies the mounting dimensions of the castor plate, ensuring proper fit and compatibility with the equipment.


Mastering the terminology and features of castors and wheels is essential for selecting the right components to meet your specific requirements. Whether you're navigating a bustling warehouse, manoeuvring equipment in a clean room, or transporting goods in a high-temperature environment, understanding the intricacies of castors and wheels empowers you to optimise performance, safety, and efficiency in your operations. By leveraging the insights provided in this guide, you can make informed decisions and choose the perfect castors and wheels for your application, ensuring smooth and reliable operation for years to come.


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