"Zhuhai NTN Bearing an authorized dealer (NSK Bearings China's total distribution) 
 "Zhuhai NTN Bearing an authorized dealer (NSK Bearings China's total distribution) 

 Each one bearing model has its own limit speed, it is determined by physical characteristics such as size, type and structure, the speed limit is the maximum operating speed of a bearing (usually r? Min), more than this limit will the bearing temperature, lubricants dry, even the bearings stuck. The speed range required to use the occasion to help determine what type of bearing, Figure 1