INA inner rings are made from hardened rolling bearing steel and have precision machined or ground raceways.
INA inner rings are used where:
- the shaft cannot be used as a raceway for INA needle roller and cage assemblies, INA drawn cup needle roller bearings with open ends, drawn cup needle roller bearings with closed end and needle roller bearings
- needle roller bearings must be combined with wider inner rings in order to allow larger axial displacements of the shaft in relation to the housing
- optimum running surfaces are required for seal lips.
Precision machined raceway
Inner rings IR have a precision machined raceway.
Chamfers on the end faces allow easy insertion into the bearing and prevent damage to the seal lips of the bearing.
Inner rings are available with and without a lubrication hole. Rings with a lubrication hole have the suffix IS1.
INA inner rings LR have a ground raceway. The end faces are turned and the edges are broken.
These rings have larger tolerances than the rings IR. They are thus suitable for applications that allow larger width tolerances and less demanding requirements for axial runout.