Minimum load

For additional
(→ 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 capacityFa ≤ 0,6 Fr

Excessive axial load can lead to a considerable reduction in bearing service life.
Equivalent dynamic bearing load

For additional
(→ Equivalent dynamic bearing load)
Fa/Fr ≤ 0,6 and P ≤ 0,5 C0 
→ P = Fr + Fa

Perform calculations
Equivalent static bearing load

For additional
(→ Equivalent static bearing load)
Fa/Fr ≤ 0,6
→ P0 = Fr  + 0,5 Fa

Perform calculations


C0=basic static load rating [kN] (→ product tables)
dm=bearing mean diameter [mm]
= 0,5 (d + D)
Fa=axial load [kN]
Fr=radial load [kN]
Frm=minimum radial load [kN]
kr=minimum load factor (→ product tables)
n=rotational speed [r/min]
P=equivalent dynamic bearing load [kN]
P0=equivalent static bearing load [kN]
ν=actual operating viscosity of the lubricant [mm2/s]
SKF logo