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Choosing A Castor

Choosing A Castor

How to Choose the Correct Castor and Wheel

 Just Castors offers many different types and styles of castors and wheels.  Our castor products are available in various specifications and combinations and are available in general duty, medium duty, and heavy duty capacities

Many varying and individual factors must be balanced to make a castor selection that will do the best job for you therefore there is no simple formula or rule that can be followed in selecting the proper castors. However Just Castors have put together some broad guidelines that should be useful when making your castor selection.

Calculating The Castor Load Rating

  • Add together the maximum expected load for the equipment and the weight of the equipment itself
  • Add 20-30% to the load as a safety margin
  • Divide this by the number of castors that will be attached

Choosing The Castor Wheel Based On Floor Surface

  • Generally a soft tread rolls better on a hard floor and a hard tread rolls better on soft floors. 
  • Ensure that the wheel is large enough to pass over cracks and obstructions.
  • Harder tyres require less effort to start the wheel turning on smooth surfaces. For sustained lower push effort over rough ground high resilience tyres are best.
  • Nylon or polyurethane tyres are more suitable for dirty floors as they resists particle embedment.
  • Domed tyred wheels require less force to roll especially on carpeting. Flat profiles tend to spread the load and prevent damage to floors at high load ratings.
  • Natural rubber is not recommended in corrosive environment. Polyurethane and thermoplastic rubber (TPR) are virtually impervious to most solvents and chemicals.

Choosing The Castor Wheel Diameter

  • As a rule of thumb, the larger the wheel, the easier it is to push and to pass over bumps and minimize vibration.

Choosing The Castor Bearing/Bush Type

  • Ball Bearings are used in applications where heat can build up due to friction. Ball bearings offer the lowest-friction and therefore the lowest push-effort. 
  • Roller Bearings are used in high-impact applications. Roller Bearings are not suitable for high speed (more than 6 kph).
  • Plain Polymer bushes are used in corrosive environments. Plain bushes are also used to reduce cost.

Choosing The Type Of Brake & Castor Configuration

Each arrangement offers its own advantages and performance qualities.

  • 4 Swivel - Maximum manoeuvrability. Can be moved back & forth and sideways. Perfect for confined spaces.
  • 2 Swivel 2 Fixed or DL - Good nanoeuvrability except in confined spaces (cannot move sideways.
  • 4 Swivel 2 Fixed - High manoeuvrability. Can be turned in own length but not moved sideways.

Choosing Castor Fittings

Castors are generally mounted to a piece of equipment in one of two ways:

  • Plate Mount for equipment that has a smooth flat base such as a sheet of wood or steel.
  • Bolt Hole Mount fitted by a stem of some sort.
    • Expanding Adaptors Suitable for installing into tubular legs for wheel diameters of 125mm or less.
    • Pintle Bolts Used when screwing directly into a threaded hole (such as a nut welded into tube) or a threaded tube end.
    • Threaded Tube Ends Available to suit a wide range of round, square and rectangular tube sizes.
    • Grip Neck & Friction Stems Available to suit very narrow tubes only.
    • Solid Pintles Ideal for large diameter wheels & applications that involve long distances or high vibration.

 

 

 

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