The BK Series is a fixed-side support unit for general ball screws, featuring a compact square design for easy installation in confined spaces . It incorporates preloaded JIS Class 5 angular contact ball bearings, delivering high rigidity and rotational accuracy . Bearings are pre-lubricated with lithium soap grease and sealed for long, maintenance-free operation . With sizes for shaft diameters from 10mm to 40mm, it suits diverse industrial automation and machine tool applications .