1. The condition of the bearing ring relative to the load is rotating or swinging relative to the load direction. Interference fit or transition fit should be selected. A clearance fit should be selected for ferrules that are fixed relative to the load direction. When the non-separable bearing is used as the flow support, the ring fixed with respect to the load direction should be used as the floating ring, and the clearance fit or transition fit should be selected.

2. The type and size of the load When subjected to an impact load or a heavy load, a closer fit should generally be selected than the normal and light load. The radial bearing load is divided by the ratio of the radial equivalent dynamic load PR to the radial rated dynamic load CR. The greater the load, the greater the interference. Load size PR/CR light load is less than or equal to 0.07, normal load is greater than 0.07 to 0.15, heavy load is greater than 0.15.

3. As the size of the bearing increases, the larger the selected interference fit, the larger the clearance fit.

4. The use of interference fit in the bearing clearance will result in a reduction in the bearing clearance. After installation, the clearance of the bearing should be checked whether it meets the requirements for use, so that the fit and bearing clearance can be selected correctly.

5. Other factors affect the material, strength and thermal conductivity of the shaft and bearing seat; the heat conduction path and heat generated from the outside and in the bearing, support installation and adjustment performance, etc., all affect the choice of fit .