The BCHA9 is a compact, press-fit ball transfer unit (often referred to as a universal ball roller). It is designed for omni-directional, 360-degree smooth movement in light-duty material handling, guide rails, and transport conveyors. Model BCHA9 Brand ZH Material Chrome Steel precision P0 P6 P5 P4 Product Description The BCHA9 is not a traditional rotary bearing, but a press-fit fixed universal ball transfer unit (Ball Roller). It is mainly used in material handling systems