This deep groove ball bearing carries radial and moderate axial loads in a single row of balls, with a bore diameter of 4.0 mm, outside diameter of 13.0 mm and width of 5.0 mm. Mass is 3.0 g. The bearing is fitted with metal shields on both sides and uses a steel sheet metal cage (JN). Limiting speed is rated at 61000 1/min, with a reference speed of 44500 1/min. Radial internal clearance is CN (Group N), the standard clearance class, suitable for applications without special fit requirements. The steel shields protect the raceway and balls from contact with coarse contaminants while allowing the pre-applied grease to remain in the bearing, so no external relubrication is required in normal operation. The steel sheet metal cage keeps the design compact and light, matching the small bore and outside diameter of this size.