General bearing model table will have the speed limit of this indicator, what does it mean? Bearings beyond a certain operating speed will start to produce an uncontrollable internal heat. The speed limit varies depending on the bearing type, size, lubrication system, bearing internal design, and working load. In addition, the speed limit will vary depending on the type of composite bearing used, depending on the speed of the seal contact area. The term "speed limit" generally refers to the estimated speed, revolutions per minute, at which the bearing will remain in service. The general size table gives the grease and oil lubrication speed limit. This value is based on a horizontal shaft, suitable for smooth running, light-loaded bearings.