Crossflon LR D5 is a general commercial bearing capable of continuous non-lubricated operation at PV values up to approximately 0.35. Fig 1 shows the wear rates as a function of time at various PV values. The use of lubricants or cooling fluids allow the bearings to operate at higher PV values. Temperature should also be taken into consideration, generally as the temperature rises above ambient, PV values decease and at lower temperatures PV values increase.