# Loads

 Minimum load For additional information (→ Requisite minimum load) Perform calculations The weight of the components supported by the bearing, together with external forces, generally exceed the requisite minimum load. If this is not the case, the bearing must be subjected to an additional radial load. Axial preload can be applied by adjusting the inner and outer rings against each other, or by using springs. Axial load carrying capacity Pure axial load → Fa ≤ 0,5 C0 Small bearings1) and light series bearings2) → Fa ≤ 0,25 C0 Excessive axial load can lead to a considerable reduction in bearing service life. Equivalent dynamic bearing load For additional information (→ Equivalent dynamic bearing load) Single bearings and bearing pairs arranged in tandem: Fa/Fr ≤ e → P = Fr Fa/Fr > e → P = X Fr + Y Fa Bearing pairs arranged back-to-back or face-to-face: Fa/Fr ≤ e → P = Fr + Y1 Fa Fa/Fr > e → P = 0,75 Fr + Y2 Fa Perform calculations Equivalent static bearing load For additional information (→ Equivalent static bearing load) Single bearings and bearing pairs arranged in tandem: P0 = 0,6 Fr + 0,5 Fa P0 < Fr → P0 = Fr Bearing pairs arranged back-to-back or face-to-face: P0 = Fr + 1,7 Fa Perform calculations

1) d ≤ 12 mm
2) Diameter series 8, 9, 0, and 1

## Symbols

 C0 = basic static load rating [kN] (→ product table) dm = bearing mean diameter [mm] = 0,5 (d + D) e = limit for the load ratio depending on the relationship f0 Fa/C0 (table 1) f0 = calculation factor (→ product table) Fa = axial load [kN] Fr = radial load [kN] Frm = minimum radial load [kN] kr = minimum load factor (→ product table) n = rotational speed [r/min] P = equivalent dynamic bearing load [kN] P0 = equivalent static bearing load [kN] X = calculation factor for the radial load (table 1) Y = calculation factor for the axial load depending on the relationship f0 Fa/C0 (table 1) ν = actual operating viscosity of the lubricant [mm2/s]