This is a single row deep groove ball bearing, Generation C design, with bore diameter 12.0 mm, outside diameter 37.0 mm, and width 12.0 mm. Net mass is 0.055 kg. The bearing carries a steel sheet metal cage (JN) and features radial internal clearance C3, providing greater internal play than standard clearance. Limiting speed is 31000 1/min, with a reference speed of 21900 1/min. The C3 clearance allows this bearing to compensate for shaft deflection and thermal expansion under operating temperature rise, making it suitable where a tighter fit or elevated running temperature would otherwise reduce internal play below the required level. The steel sheet metal cage keeps mass low and supports the stated speed ratings. No sealing or shielding is specified for this bore type (Z), so external protection and lubrication must be provided separately according to the operating environment.