Deep groove ball bearing 16004-A is a single row design with a steel sheet metal cage (JN), built to the narrow 160.. section, combining a 42.0 mm outside diameter with only 8.0 mm width at a 20.0 mm bore. The bearing weighs 0.048 kg and is rated for a limiting speed of 26000 1/min, with a reference speed of 13800 1/min, giving it a favorable balance between load-carrying cross-section and axial compactness. Radial internal clearance is set to CN (Group N), the standard clearance class, suitable where no special preload or extra play is required. The steel sheet metal cage keeps rotating mass low, supporting the high limiting speed, while the narrow width makes this bearing suitable for applications where axial space is restricted but a 20.0 mm shaft diameter must still be supported. No sealing or shielding is specified, so lubrication supply and contamination protection have to be provided externally.