It is composed of washer-shaped raceway ring, balls and holder group. The raceway ring matched with shaft is called shaft washer and that matched with shell is called housing washer. Double-direction thrust bearings coordinate central washer shaft. Single-direction bearing can bear unidirectional axial load while double-direction bearings can bear bidirectional axial load (both of them cannot bear radial load).
Main uses: King pin of automobile, machine tool spindle