The radial clearance of needle roller bearings can be adjusted after installation, such as angular contact ball bearings and tapered roller bearings; some have been adjusted in accordance with the standards during manufacturing, and they cannot be adjusted after installation. Adjustment, such as deep groove ball bearings, self-aligning ball bearings, cylindrical roller bearings, spherical roller bearings, etc. If this type of bearing is unqualified after installation and the radial assembly clearance is too small