Available space

In many cases, the principal dimensions of a bearing are predetermined by the machine’s design. For example, the shaft diameter determines the bearing bore diameter.
For small-diameter shafts all types of ball bearings can be used, the most popular being deep groove ball bearings; needle roller bearings are also suitable (fig. 1). For large-diameter shafts, cylindrical, tapered, spherical and toroidal roller bearings and deep groove ball bearings are available (fig. 2).
When radial space is limited, bearings with a low cross-sectional height, should be chosen. These can include needle roller and cage assemblies, drawn cup needle roller bearings and needle roller bearings with or without an inner ring (fig. 3). Other bearing types in the 8 or 9 diameter series can also be used.
When axial space is limited, narrow series cylindrical roller bearings and deep groove ball bearings can be used to accommodate radial or combined loads (fig. 4). Combined needle roller bearings (fig. 5) can also be used. For purely axial loads, needle roller and cage thrust assemblies (with or without washers) as well as thrust ball bearings and cylindrical roller  thrust bearings can be used (fig. 6).
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