http://www.skf.com/portal/skf/home/p...&newlink=1_3_1
From the SKF webpage you can read:
Quote:
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Single row angular contact ball bearings can accommodate axial loads acting in one direction only. Under radial loads a force acting in the axial direction is produced in the bearing, and this force must be counteracted. Consequently the bearing is normally adjusted against a second bearing.When two single row angular contact ball bearings are used, they must be adjusted against each other until the requisite preload or clearance is obtained.
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A tandem disposition would only stand loads in one direction.
An "X" (face to face) disposition would absorb less bending moment loads, as the pressure centers of both bearings are closer to each other.
(The center of pressure is the intersection between 2 imaginary lines -axle centerline and the angle in the pic above)