Double row deep groove ball bearings  are very suitable for bearing arrangements where the load carrying DOUBLE-ROW BEARINGS capacity of a single row bearing is inadequate. For the same bore and outside diameter, double row bearings are slightly wider than single row bearings in the 62 and 63 series, but have a considerably higher load carrying capacity.
Double Row Angular Contact ball bearings have two rows of balls arranged back-to-back. ... This means the bearings are particularly suitable for accommodating simultaneously acting radial load and axial load in both directions. They are also available with seals or shields.

The advantage of double row angular contact ball bearings as compared to single row angular SKF 6312 Bearing contact ball bearings is that they can bear radial and axial loads in both directions. Double row angular contact ball bearings have a steep mounting, which also can bear tilting effects.