These bearings comprise a radial needle roller bearing and an axial cylindrical roller bearing with a plastic cage. They do not have an inner ring and require a shaft raceway that is hardened and ground. If the shaft cannot be used as a rolling bearing raceway, inner rings IR can be used instead.
Type NKXR is not self-retaining. The radial needle roller bearing, axial cylindrical roller bearing and shaft locating washer can be fitted independently of each other. In self-retaining design NKXR..-Z, an additional sheet steel end cap secured to the radial bearing component holds the axial bearing component together.
In order to support axial forces, the axial bearing component must be preloaded to 1% of the basic static axial load rating. Skewing between the shaft and housing is not possible.
If the bearing design capable of supporting axial loads in one direction is to support axial forces from alternating directions, two bearings must be adjusted against each other.