SKF E2 Energy Efficient Bearings. SKF E2 Energy Efficient Bearings are deep-groove, shielded, ultra-low friction bearings that feature an optimised design, balanced between internal geometry, grease and cage type. With 30 to 50% lower friction when compared with standard SKF bearings, the energy savings achievable when using SKF Energy Efficient Bearings are substantial, and the bearing life is extended significantly - in most cases more than double. SKF E2 Energy Efficient Bearings offer ultra-low friction and typically generate less heat and can operate at higher speeds than ISO or SKF Explorer Bearings. Dimensionally fully-compatible with standard bearings. Typical applications for SKF Energy Efficient Bearings include:. Electric motors up to 37kW (50HP) Light to medium-loaded machines with shaft diameters up to 60mm Excellent drop-in replacement for in-service electric motors