Typically, the axis is based on bearing in the radial and axial support side of the bearing is called the fixed end bearings, withstand the radial and axial two loads from the fixed axis relative axial displacement between the bearing housing. The other side called the free end, only radial loads, axial relative movement.

Fixed end bearing must be with the shaft and bearing housing fixed, more suitable bearing is able to withstand the composite load radial bearing, such as deep groove ball bearings, spherical roller bearings and double row or paired angular contact ball bearings or tapered roller bearings. Under pure radial load, radial bearing assembly with ribs, such as the inner and outer rings of cylindrical roller bearings with deep groove ball bearings or four point contact ball bearings or bi-directional thrust bearing assembly can also be used as a fixed end bearing. At this time, the second bearing a two-way axial positioning, but must be installed with the bearing housing to maintain some radial interval. Free end of the bearings in the shaft due to thermal expansion, changes in length, bearing is not squeezing. Axial displacement can occur inside the bearing, but also can occur in the bearing ring and bearing.

"Cross-fixed" refers to such bearing configuration, each bearing one-way positioning axis, and in the opposite direction. This combination is mainly used for short axis. All radial bearings can withstand at least one direction of axial load are applicable, including deep groove and angular contact ball bearings, tapered roller bearings, as well as the NJ type cylindrical roller bearings, angular contact ball bearings or tapered roller bearings, some cases, you must apply the preload.