Full definition
Hypothetical constant load (pure radial or pure axial) that would produce the same bearing life as the actual combination of radial Fr and axial Fa loads. For radial bearings: P = X路Fr + Y路Fa, where X and Y are tabulated factors from manufacturer catalogs based on bearing type and geometry. For thrust bearings: P = Fa + Y路Fr. ISO 281 standard. Correct calculation is essential for proper bearing selection. Reference brands: SKF, FAG, NSK.