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Typically, the counterface becomes scored when a contaminant particle is caught under the sealing lip and abrades a track as the shaft rotates. As this continues, the seal will enable more particles to pass or get stuck, and seal efficiency deteriorates, eventually leading to malfunction of the component that the seal is meant to protect. To rectify the situation, it is necessary to repair the shaft surface since a seal replacement will not be sufficient. To repair the shaft, it is usually necessary to disassemble the machine in order to either replace the shaft or grind down the counterface until it is again within bearings specification. 

SKF SPEEDI-SLEEVE is a well-proven solution to overcome problems with worn shafts without having to disassemble the shaft or changing the seal dimensions, while offering an excellent sealing surface. Now, SKF has developed a new generation SKF SPEEDI-SLEEVE with features providing an even further enhanced sealing system performance. Using SKF SPEEDI-SLEEVE, combined with an SKF radial shaft seal, customers will benefit from a more consistent and increased durability of the sealing system. This will enable a more stable maintenance planning with improved predictability of the system service life. SKF bearings SPEEDI-SLEEVE is available for shaft diameters up to approximately 203 mm. For larger shaft diameters, SKF offers wear sleeves for heavy industrial applications, LDSLV3 and LDSLV4. For detailed information regarding LDSLV designs.

If the shaft cannot be ground and hardened as a seal counterface or if a replaceable seal counterface is required, needle roller bearing inner rings with non-directionally ground raceway can be used. 

SRG customers have depended upon our premium quality, design performance and technical support for more than 75 years. Our brands include SRG,Link-Belt, and MB encompassing ball bearings, cylindrical roller bearings, sleeve bearings, and collar and adapter mounted spherical roller nachi bearings. Those who recognize the importance of keeping their application running smoothly value SRG's dependability and quality.

Plain bearings and sleeve bearings (also referred to as bushings or journal bearings) are used to constrain, guide or reduce friction in rotary or linear applications. They function via a sliding action instead of the rolling action used by ball, roller, and needle bearings. Plain bearings and sleeve bearings are made from a variety of materials and are often self-lubricating to provide smooth operation and greater durability. They consist of one part that is built up of many types of materials, layered and combined into a load carrying system. Plain and [sleeve bearings] are often very inexpensive, compact, lightweight, and have a high load-carrying capacity.