A load moduleor air caster is a machined assembly – either lightweight aluminum or steel – that houses an air bearing.
Load modules – also known as air casters – are available for each size of air bearing.
Load modules are fitted with inlet ports, or air flow control valves, and contain air chambers that allow air to flow from the inlet to the air bearing to cause pressurization and eventual flotationto take place.
Shown to the right is a typical square aluminum air caster module. The yellow part is the actual air caster load module and the black inner section is the air bearing assembly.