100mm Pressed Steel Fixed Castor with Black Rubber on Polypropylene Wheel - 75kg Load Capacity

Top Plate Dimensions & Mounting

What is the difference between a fixed castor and a swivel castor?

A fixed castor is designed to roll in a straight line only, providing directional stability and controlled movement. It cannot rotate or change direction. A swivel castor, by contrast, rotates 360 degrees around a vertical axis, allowing for multidirectional movement and enhanced manoeuvrability. Fixed castors are typically used on the rear of trolleys or carts, while swivel castors are mounted at the front for steering.

Can this castor be used on all floor types?

Yes, the black rubber tread is suitable for most common floor surfaces including concrete, tile, vinyl, laminate, and sealed wood. The soft rubber material protects floors from scuffing and marking, making it particularly well-suited for retail, office, and institutional environments. However, for extremely delicate surfaces such as polished marble or high-gloss finishes, consider testing in an inconspicuous area first or consulting with a flooring specialist.

How do I determine the correct load capacity for my application?

To calculate the required load capacity, first determine the total weight of your equipment plus the maximum load it will carry. Divide this total by the number of castors you plan to install, then add a safety margin of 25-30% to account for uneven weight distribution and dynamic forces during movement. For this castor rated at 75kg per unit, a typical four-castor configuration can safely support up to approximately 225kg total weight.

What fixings are required to mount this castor?

This castor features a standard 4-hole top plate with 10mm diameter mounting holes. You will need four M8 or M10 bolts (depending on your preference and equipment base thickness), along with corresponding washers and either nuts or threaded inserts. For optimal security, use grade 8.8 or higher bolts and ensure they are tightened to the manufacturer's recommended torque specification. The mounting surface should be flat, clean, and structurally sound to ensure proper load distribution.