SKF

Lubrication (Rolling Bearings Selection)

Lubrication is a decisive factor in rolling bearing performance and longevity. It prevents metal-to-metal contact, reduces friction and wear, dissipates heat, protects against corrosion, and seals surfaces from contaminants. SKF’s lubrication selection process for rolling bearings considers grease versus oil, base oil viscosity, thickener type, NLGI grade (for grease), relubrication intervals, and delivery method. The correct lubricant forms an elasto-hydrodynamic (EHL) film that separates rolling elements from raceways. When the viscosity ratio κ (kappa) is ≥1, full film separation greatly extends bearing life. SKF provides tools to calculate required viscosity, grease relubrication intervals, and oil flow rates, as well as recommendations for solid oil, food-grade greases, and lifetime-sealed bearings. Integrating lubrication into the bearing selection process ensures that the design meets its intended service life under real operating conditions.