Bearings can be stored in their original packaging for many years, provided that the relative humidity in the storeroom does not exceed 60% and there are no great fluctuations in temperature. The storeroom should also be free of vibrations and shaking.
With sealed or shielded bearings it may be found that the lubricating properties of the grease with which they are filled may have deteriorated if the bearings have been stored for a long time. Bearings that are not stored in their original packaging should be well protected against corrosion and contamination.
Large rolling bearings should only be stored lying down, and preferably with support for the whole extent of the side faces of the rings. If kept in a standing position, the weight of the rings and rolling elements can give rise to permanent deformation because the rings are relatively thin-walled.