Consisted of a pair of rings, retainer and a group of steel balls, is the common and widely used bearing for its simple structure and easy operation.
It can carry great radial load and a little axial load from all directions. If you increase, to some extend, the radial tolerance of this kind of bearings, it can be used as angular contact ball bearing and carry relatively higher axial load. After being mounted on the shaft, the bearing serve a function to limit the axial displacement between shaft and bearing housing to the tolerance range. And the bearing can keep well performance even if relative tilt( degree of tilt subject to tolerance range) appeared between shaft and housing. Once tile exist, service life will be shortened.Compared to other kinds of bearings, DGBB can be featured as low friction high top rotating speed. It can be used, instead of thrust ball bearings, to carry great radial load in the situation that high rotating speed is required.
   Additionally, the rotating speed of this kind of bearing can be increased further if rubber, copper or duralumin are used in manufacturing the retainer.