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what size castor

What size castor do I need?

06 August 2020

Answering some basic selection criteria questions to start, will help in choosing the best suited Castor product.

Castor Wheel Considerations: 

- Castor & Wheel dimensions, Castor type (Swivel, total lock braking, fixed (Rigid) for example. Castor fitting (Plate, single bolt hole for example)
- Total load of application.
- Running surface.
- Environment of use.
- Castor configuration.

More challenging applications 

- Speed & travelling distance.
- Electrically conductive requirements.
- Temperature ranges.
- Wash down processes.
- Weight loading distribution.
- Floor pressure & surface contact.
- Wheel Tread material, shore hardness.
- Castor offset.
- Push & pull resistances.
- Industry relevant standards
- Safety factors 

Pushing and Pulling

Preferably the application should be designed to be pushed and not only pulled, to reduce the possibility of injuries to a minimum. Pulling is only possible with either arm stretched out at the back, which may result in being “run-over” by the equipment.  At times the equipment being pulled can be very heavy or taller than the person pulling the cart, which in turn can impede the line of sight for the person pulling the equipment.  
The most important factor besides the load rating is ease of movement or maneuverability. An easy to move equipment is a piece of equipment that will be used and moved often, with little effort and therefore a lot faster. It all adds up to the point that reduces downtime and increases output. The initial starting force is always the greatest to overcome. The rolling resistance is significantly lower and should not be considered as a determining factor for choosing the right wheel type. The following points determine push and pull forces.

Swivel resistance

Depends not only on wheel type and offset but also on the bearing type. A precision ball bearing in the swivel head gives minimum resistance and is possible up to a certain load capacity. For extra heavy loads a dual-way ball race may be required

Wheel bearing

Besides the tread, wheel diameter and swivel bearing, the wheel bearings determine how smooth a castor will travel and thus the quality of the caster.

There can be many factors when considering the very best optimised solution, rest assure with almost 100 years’ experience, TENTE can support moving you and your product move efficiently & safely in the right direction.