Q: What is pretension of rolling bearings? Why do rolling bearings need to be pre-tightened?

A： The so-called pre-tightening is to generate and maintain an axial force in the bearing in a certain way during installation, so as to eliminate the axial clearance in the bearing and produce initial deformation at the contact point between the rolling body and the inner and outer rings.

Click here to view SUNBEARING rolling bearing.