In order to facilitate the installation of the seated rolling bearing and the shaft, generally the inner ring of the bearing and the shaft adopt a clearance fit. However, the size of the clearance between the inner ring of the bearing and the shaft is related to the allowable speed of the seated bearing. The higher the speed, the smaller the clearance between the inner ring of the bearing and the shaft. According to the matching type of bearing inner ring and shaft, the coefficient of permissible speed correction of rolling bearing with seat is shown in Table 6.2. The allowable speed of the bearing with stop screw is corrected by multiplying the allowable speed (standard value) by the fit coefficient according to the tolerance zone of the used shaft. For bearings with fasteners, shafts with tolerances h8 or h9 are recommended, and shafts with tolerances h5 or j5 are recommended for bearings with eccentric fixing rings. Fitting coefficient fc for seated rolling bearings (recommended) Types of seated rolling bearings Fitting coefficients fc tolerance zone of shaft h5, j5, j6, h6, h7, h8, h9 with set screws, ordinary products with triple seals (accessory symbol L3) 1 1 0.8 0.5 0.2u0026#1048576;1 1 0.9 For heat resistance (special symbol D1K2) for cold resistance (special symbol D2K2) 1 1 0.71 1 0.7 For high speed (special symbol K3) For blower (special symbol S5) 1 0.8 0.6 1 0.8 0.6 1 1 With eccentric fixing ring.