THB ZKLF/ZKLN/ZARF/ZARN ball screw support bearings, are used for ball screws, with high precision P4 runout and tolerances. Most of our ZKLF/ZKLN/ZARF/ZARN ball screw support bearings are exported to Germany, The netherlands, USA, UK, Australia, etc. We THB Bearings have been certified by a German company TUV Rheinland since 2010. All the quality assurance is corresponded to ISO9001:2008.