This single row deep groove ball bearing carries a bore of 20.0 mm, outside diameter of 72.0 mm, and width of 19.0 mm, with a net mass of 0.405 kg. It uses a steel sheet metal cage (JN) and features normal radial internal clearance (CN, Group N). The limiting speed is rated at 14000 1/min, with a reference speed of 11700 1/min. The 6404-A design, with its steel sheet metal cage and standard CN clearance, suits applications requiring reliable radial load support at moderate to high rotational speeds. The bore type Z indicates a specific bore configuration suited to standard shaft fits. The combination of cage material and clearance class supports stable operation under the specified speed ratings, provided appropriate lubrication is maintained to match the reference speed conditions.