Single row angular contact ball bearing has the following several kinds of structure forms (1) the separation type angular contact ball bearings This kind of bearing, code-named S70000, the outer ring then no lock, can with the inner ring, cage, steel ball component separation, thus it can be installed separately. Such are the miniature bearing inside diameter less than 10 mm, used in gyro rotor, micro motor and other stability of dynamic balance, noise, vibration, there are higher requirements of the device. (2) the separation type angular contact ball bearings This kind of bearing ring channel lock mouth, so the two ring cannot be separated. According to the contact Angle is divided into three types: 1) contact Angle a = 40 °, is suitable for large axial load; (2) contact Angle a = 25 °, used for precision spindle bearing; (3) the contact Angle of a = 15 °, usually for large size precision bearing. (3) the configuration of the angular contact ball bearing in pairs Configuration of angular contact ball bearing in pairs used to bear radial load and axial load at the same time,BEST Needle Roller Bearings also can withstand any pure radial load and direction of axial load. These bearings by the manufacturer in accordance with the requirements of certain pre-load optional combination in pairs, provided to the users. When the bearing is installed on the machine after fastening, completely eliminate the clearance of the bearing, and makes the ring and steel ball in the preloaded state, thus increasing the rigidity of composite bearing. Configuration of angular contact ball bearing in pairs there are three kinds of different configuration types: (1) the configuration back to back, rear code-named DB (such as 70000 / DB), the configuration of good rigidity, under negative moment performance is good, the bearing can be subject to bi-directional load; (2) face-to-face configuration, rear code-named DF (such as 70000 / DF), the configuration of the rigidity and the ability to withstand the overturning moment than the DB configuration forms, the bearing can be subject to bi-directional load; (3) series configuration, rear code-named DT (such as 70000 / DT), this configuration can also be in the same series of three or more bearing support, but can only carry axial load in single direction. Usually, in order to balance and limit shaft axial displacement, another supporting point should be installed to withstand another direction axial load bearing.