This end cap seals the open end of the housing unit, closing off the bearing bore to keep the internal cavity protected once the shaft assembly is fitted. It carries a net mass of 0.02 kg, which corresponds to a small-diameter cover designed for compact housing sizes within the KASK06 range. Fitting this cap prevents ingress of dust and moisture from the unsupported end of the bearing arrangement, reducing contamination of the grease and rolling elements. As a passive component with no seal lip or bearing contact surface of its own, it relies on the housing fit for retention and requires no separate lubrication or maintenance once installed.