There are three different configuration types of paired angular contact ball bearings:
(1) back-to-back configuration, after code DB(such as 70000/DB), this configuration has good rigidity, good performance under overturning moment, bearing can withstand two-way axial load;
(2) face to face configuration, after code DF(such as 70000/DF), this configuration of rigidity and ability to withstand overturning moment is not as good as DB configuration, bearing can withstand two-way axial load;
(3) Series configuration, after the code DT(such as 70000/DT), this configuration can also series three or more bearings at the same support, but can only bear a single direction of the axial load. Usually, in order to balance and limit the axial displacement of the shaft, the other support shall be equipped with a bearing capable of bearing the axial load in the other direction.
In addition, a single row angular contact ball bearing is available for any pairing. This kind of bearing is specially processed and can be combined in any way such as two back-to-back, two face to face or two in series. The axial clearance of pairing combination can be selected according to needs. The post code CA means the axial clearance is small, CB means the axial clearance is moderate, and CC means the axial clearance is large.
Universal matching bearings can also be configured into bearings with pre-interference according to the requirements of use, and the code GA, GB, GC. GA represents small preinterference after pairing. GB indicates moderate preinterference after pairing; GC indicates a large preinterference after pairing.
