Not all bearings require a minimum working clearance and you must select the appropriate clearance depending on the conditions. In GB 4604-93, the radial clearance of the rolling bearing is divided into five groups - 2 groups < 0 group < 3 groups < 4 groups < 5 groups, wherein 0 group is the standard clearance. The basic radial clearance group is suitable for general operating conditions, conventional temperature and common interference fit. 1. Bearings operating under special conditions such as high temperature, high speed, low noise and low friction should use large radial clearance. 2, for the precision spindle, machine tool spindle bearings, etc. should choose a small radial clearance; 3, for roller bearings can maintain a small amount of working clearance.

In addition, there is no play for the separate type of bearing; finally, the working clearance after the bearing is installed is smaller than the original clearance before installation, because the bearing has to bear a certain load rotation, and The amount of elastic deformation produced by the bearing fit and load.