INA rolling bearing pre-tightening methods into radial preload method and axial preload method two kinds big, simple introduction is as follows: 1. The method of radial preload Radial head method use in bear radial load more INA bearings taper hole, a typical example is the double row precision short cylindrical roller bearing INA, using the nut to adjust the INA bearing axial position relative to the conical journal, that the expansion of the inner ring with appropriate amount, get the radial clearance, the method used in machine tool spindle and jet engines. 2. The method of axial preload Axial preload method in general can be divided into two locating preloaded and constant pressure preload. In positioning preloaded, can be adjusted through sleeve or the size of the gasket, obtain proper preload; Can also be a tuning by measurement or control starting friction torque suitable pre-tightening; Can also be used directly adjusted the amount of preloaded double in pairs in advance to achieve the purpose of the pre-tightening INA bearing, generally do not need to users adjust any right now, all in all, by axial pre-tightening INA bearings, when using its relative position will not change. Constant pressure preload is to use such as spiral spring, disc springs that INA bearings get appropriate pre-tightening methods. Preloaded spring rigidity, a rigid much smaller than the INA bearing, INA bearing so constant pressure preload relative position in use will have change All Kinds Of Size Of SKF Bearing http://www.abt-fag.com/INA-bearings.html , but the preloaded were roughly the same amount.