This end cap seals the open end of a linear guidance or bearing housing assembly, preventing ingress of contaminants from the shaft or rail side. It is a lightweight component with a net mass of 0.008 kg, designed as a closing element rather than a load-carrying part. The catalogue designation KASK04 identifies this specific size within the INA end cap range. Fitted onto the housing, the cap keeps grease or oil retained inside the assembly and blocks dust, moisture, and debris from reaching the internal raceway or guideway. Its small mass and simple geometry make installation straightforward during assembly or maintenance, and it should be replaced whenever removed if its sealing lip or fit shows wear, to maintain the protection of the lubricated components inside.