The Schaeffler Group has a highly sophisticated range of axial angular contact ball bearings for screw drives that allow absolute positioning accuracy at very high speeds in longitudinal machine tool axes. The highly-dynamic operating conditions found in screw drives require precise, rigid, low-friction bearing supports that can support axial and radial loads. The INA ZKLN and ZKLF double-row axial angular contact ball bearings from Schaeffler, which are ready to fit and either low-maintenance or maintenance-free, have proven their suitability for this application. These bearings will be available in X-life quality from the beginning of 2014 onwards. The optimized contact surfaces between the rolling elements and the raceway reduce friction in the bearing and allow higher limiting speeds to be achieved. This reduces both energy consumption and operating costs.