How to Select a Castor?

The selection of a castor can have several deciding factors, when deciding the correct type of Castor to use for your application.

1.  Calculate the Maximum weight on each Castor.  Extra consideration should be taken for unequal loadings etc.
     It is always better to use a higher capacity castor than you actually require.

2.  Remember: Larger Diameter wheels provide more manoeuvrability.

3.  Soft Wheels such as Black Rubber Castors, offer more resistance/grip, and are therefore better for hard surfaces (such as concrete floors & castors for warehouse equipment). They also offer some protection to the floors surface and are considered Low Noise. Black Rubber Castors are generally used for light & medium weight equipment, whereas Polyurethane castors, which are hard but flexible, can be used for lightweight to heavy duty equipment.  Hard Wheels such as our Nylon Castors & Black polypropylene Castors are suitable for both Hard surfaces & Soft Surfaces.  They offer low resistance/grip making them easy to move.  Black Plastic (Polypropylene) castors are low cost, where as Nylon castors are used where longevity of life is required.

Black Rubber Castors  -  Good Grip & Control, Good Floor Protection & Low Noise, ideal for hard surfaces
Polyurethane  Castors  -  Good Appearance, Good Grip & Control, Reasonable Floor Protection, Low Noise, Heavy Duty & Long Life, ideal for hard surfaces
Polypropylene Castors -  Ease of movement, suitable for hard & soft surfaces (such as carpet), Low Cost.
Nylon Castors - Ease of movement, suitable for hard & soft surfaces (such as carpet), Heavy Duty & Long Life.

4.  Fixing Type
Plate Fixing - Most robust type & very popular fixing method.  Uses 4 screws/bolts per castor to fit to equipment.  The plate distributres the load, and reduces stress on castor. Plate Fixing type generally offers longer life.

Bolt Hole Fixing - Easy to install where existing bolt hole exists, however better for light loads

If possible, choose the Plate Fixing Castor for longer life

5.  Manoeuvrability - Fixed, Swivel or Swivel with Brake

This depends on your application, how often it is going to be moved, and where you will move it to.  The most common combination is 2x Swivel & 2 x Swivel with brake, with the braked version at the rear, and the non-braked castors at the front. This allows for 360 degrees of movement, and the brake can be put  on when not in use.


6.  There are many other factors to consider such as contamination, shock loads, uneven load distribution, temperatures, non-marking materials etc.  The list can go on & on.  


If you have any doubt about which castor is suitable for your application, or if you have an application where the products on our website are not suitable, please contact our sales team for expert advice. 

All information on this website ( Bulldog Castors ) is given for guidance only. It is important that the customer is happy with the selection of castor for their own application & use.