thrust ball bearings comprises a blowout patch, a seat ring, steel balls and a holser. the ferrule matches axis is called blowout patch, while the ferrule matches houding is called seat ring.the thrust bearing is mainly used to be subject to axial load. it can transfer major axial liad,but it can not be subject to radial load.this type of bearing is mainly applied on automotive ssteering gear and machine tool main shaft etc.