Coefficient of friction
depends upon type of movement, finish of mating surface, ambient temperature,
bearing pressure, velocity and other variables. Figs. 1,2, and 3 were
obtained from flat specimens and may be used as a guide. Note in Fig.
1 that the coefficient drops off as bearing load increases. This offers
the advantage of using the smallest bearing sizes to obtain the least
amount of friction. Fig. 3 shows the coefficient of friction increasing
as surface velocity increases from 2-20 FPM. This feature is particularly
valuable for vehicle steering systems.