This bearing is a double row angular contact ball bearing of self-retaining, yoke type track roller design, built with a particularly thick-walled outer ring, a ball and cage assembly, and an inner ring. Axial guidance of the outer ring is provided directly by the balls. Bore diameter is 25.0 mm, outside diameter 52.0 mm, height 16.0 mm, net mass 0.162 kg. Sealing is designated 2RS, with lip seals on both sides giving combined axial and radial sealing action. The double row ball arrangement lets the outer ring carry combined radial and axial loads while resisting tilting under load, and the thick-walled outer ring adds strength to the rolling surface. The two-sided lip seal keeps the ball and cage assembly protected from contamination, supporting grease as the lubrication method without frequent relubrication.