Double-direction angular contact thrust ball bearings

SKF developed super-precision double-direction angular contact thrust ball bearings for machine tool spindles. The bearings can provide axial guidance of the spindle in both directions and are designed for mounting together with SKF super-precision NN 30 K series double-row cylindrical roller bearings. The bearings are separable, so the bearing components can be mounted separately and easily.
SKF super-precision angular contact thrust ball bearings have a 60° contact angle. This provides:
-high axial load-carrying capacity and
-particularly high axial stiffness.
 
Super-precision double-direction angular contact thrust ball bearings are manufactured with the same nominal bore size and outside diameter as the corresponding cylindrical roller bearings. However, the outside diameter tolerance of the housing washers, combined with the housing bore diameter and geometrical tolerances recommended for super-precision cylindrical roller bearings under light to normal loads and rotating inner-ring load, results in appropriate radial clearance in the housing bore. This clearance is sufficient to prevent radial loads from acting on the thrust bearing when the outer ring is not axially clamped in the housing.