Bearings for screw-drives are axial angular contact ball bearings and axial needle and cylindrical roller bearings that can support high radial forces as well as axial forces from one or both sides. These bearings are identified by prefix ZKLF, ZKLN, 7602, 7603, ZKLR, ZARF, ZARN
Bearing manufacturers such as INA, IKO, NTN,

Miniature ball screw assemblies are conventionally understood to be systems with a nominal diameter of 12mm or less. Their miniaturized nut geometries are achieved through the use of optimized recirculation systems with very small balls. These ball screws are usually not preloaded or only slightly preloaded to ensure the