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Limiting speed depends on the bearing type, its accuracy, cage design, internal clearance, operating conditions in arrangement, kind of lubrication and on other factors. This influence summary determines the heat generation in the bearing and also limited rotational speed which is first of all limited by the lubricant operating temperature.
For orientation, limiting rotational speed values are shown in the dimension tables for individual bearings in normal tolerance class, both for grease and oil lubrication.Given values are valid under presumption of adequate load
(L_10h ≧ 100 000 h) normal operating conditions and cooling.
It is also necessary to reduce the limiting speed values for radial bearings which are permanently loaded by relatively great axial force.The resulting limiting speed values depend on the ratio of axial and radial load F_a/F_r. The shown limiting speed can be exceeded for ball bearings up to 3 times, cylindrical roller bearings up to 2 times, for other bearings except spherical roller and tapered roller bearings up to 1.5 times and for spherical roller bearings 1.3 times.

This exceeding requires:
– adaptation of lubrication and cooling
– higher bearing tolerance class and coresponding accuracy of the abutment parts
– higher radial clearance than normal
– cage of suitable design and material