Castor Load Calculations

Mixed castor configurations are often the best strategy for achieving the best solution for an application or environment. Getting the castor load capacities in these mixed configurations is vital for safety and efficiency.

Two swivel + two fixed

For the safest handling and load control, it is recommended to use two fixed castors leading with the swivel castors at the back while moving. This configuration ensures easy manoeuvrability and good steering on straight runs and cambers. It is suitable for most loads. Make sure to calculate each castor’s load capacity to be at least 33% of the total load. This is because when moving, one of the castors may lose contact on uneven surfaces, causing its load to shift onto the remaining castors.

One swivel & two fixed

This configuration offers easy manoeuvrability but is only recommended for handling light loads. To ensure safe handling and avoid tipping issues, it is important to distribute the loads evenly. For this configuration, it is recommended that the castor load capacity be at least 40% of the total load weight.

Three swivel

While offering high manoeuvrability in smaller spaces, this configuration can make it harder to control the movement on straight runs or sloping and uneven surfaces, especially when carrying heavier loads. It’s important to calculate the load capacity of each castor to ensure that it is at least 40% of the total load.

Four swivel

With maximum manoeuvrability, this configuration can make controlling movement on straight runs or uneven surfaces challenging, but this issue can be mitigated using castors with directional locks. To ensure your load’s safety, the castor load capacity should be at least 33% of the total load weight.

Four swivel & two fixed, centrally pivoting.

This configuration is often used on long trolleys to improve control and manoeuvrability. It consists of two central fixed castors that are either the same size or one size larger than the swivel castors, with the top plates fitted with 25mm of packing. The fixed castors must have a capacity of at least 50% of the total load, while the swivel castor loads may vary.

Two swivel & two fixed, centrally pivoting.

Similar to the previous example but less stable if the load is not evenly distributed. As before, the two central fixed castors are usually the same size or one size larger than the swivel castors and are fitted with 25mm of packing under the top plate. Again, the castor capacity for the fixed castors should be at least 50% of the total gross load.

Swivel castor loads will vary. Please call us for expert advice on the most appropriate configurations for your requirements.