This angular contact ball bearing carries radial and axial loads through a double row ball and cage assembly running between a thick-walled outer ring and an inner ring, with the outer ring guided axially by the balls themselves. Bore diameter is 12.0 mm, outside diameter 30.0 mm, height 12.0 mm, and net mass is 0.03 kg. The design is self-retaining, so the inner ring, balls, cage and outer ring stay together as one unit during handling and mounting. Sealing is provided on both sides by lip seals (2RS), combining axial and radial sealing action to keep out contamination and retain grease inside the bearing. The double row ball arrangement and outer ring guidance make this bearing suitable for direct rolling contact on a track or rail surface, where axial guidance and compact radial dimensions are required.