The amount of load that oilless bearings must sustain will have a big impact on what type of bearing should be used for a particular application. Moreover, the various loads managed by a bearing can significantly affect on-going performance and for that reason must be carefully assessed during the selection process.
Some bearings must handle radial loads, which act perpendicularly to the axis of rotation. Some bearings must handle an axial load, which acts parallel to the axis of rotation. If the load on a bearing is offset from these axes, it creates a moment load.
The qualities, degree, and direction of acting loads can be highly varied. Generally speaking, the fundamental load ratings indicated in bearing dimension tables show load capacity. Yet, in deciding the correct bearing type, thought should also be given to load type.