This self-aligning ball bearing accommodates angular misalignment between shaft and housing thanks to its spherical outer raceway, which allows the inner ring, balls and cage to articulate relative to the outer ring. The 1204-K-TVH-C3 has a bore diameter of 20.0 mm, outside diameter of 47.0 mm and width of 14.0 mm, with a net mass of 0.116 kg. The bore is tapered at a ratio of 1:12 (bore type K), and the cage (TVH) is made of glass-fibre reinforced plastic. Limiting speed is rated at 18100 1/min, with a reference speed of 15300 1/min. The tapered bore allows mounting on a tapered shaft seat or with an adapter sleeve, giving a defined interference fit without a separate locking mechanism required for a straight bore. Radial internal clearance is C3 (Group 3), providing extra clearance to compensate for interference fit and temperature-related expansion during operation. The plastic cage design supports smooth ball guidance at the rated speeds while keeping mass low. As an open bearing, external sealing and relubrication provisions must be arranged separately according to the mounting environment.