General bearing type table will have the speed limit this index, it refers to what?
Beyond a certain operating speed the bearing will begin to generate uncontrolled internal heat.
The speed limit varies with bearing type, size, lubrication system, bearing interior design, and working load.In addition, the speed limit will vary according to the type of overall bearing seal used (depending on the speed of the seal contact zone).
The term "speed limit" generally refers to the estimated speed, revolutions per minute, at which the bearing will remain serviceable.
The limit speed of grease lubrication and oil lubrication is given in the general dimension table.This value is based on properly lubricated, lightly loaded bearings mounted on a horizontal shaft.