Oil lubrication

The viscosity values in the diagrams are expressed with ISO designations, for example ISO VG 32, where 32 is the oil viscosity at 40 °C (105 °F).
The adjusted reference speed for oil lubrication can be estimated using

nar = nr fP fν

where
nar   
=adjusted reference speed [r/min]
nr =nominal reference speed [r/min] (→ product tables)
fP =adjustment factor for bearing load P
fν
=adjustment factor for oil viscosity
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