This spherical roller bearing accommodates angular misalignment between shaft and housing through its two rows of barrel-shaped rollers running on a common sphered raceway in the outer ring. The 21308-E1-XL-K has a bore diameter of 40.0 mm, outside diameter of 90.0 mm, and width of 23.0 mm, with a net mass of 0.713 kg. The tapered bore (taper 1:12, bore type K) allows mounting on a sleeve or directly on a tapered shaft seat. Main dimensions follow DIN 635-2. Limiting speed is 9800 1/min, reference speed 5200 1/min, and the cage is of JPA design. Radial internal clearance corresponds to CN (Group N), giving the standard operating clearance range for this bearing family. The E1 design provides an optimized internal geometry for load distribution across the rollers. Relubrication follows the standard feature, and the tapered bore construction enables adjustment of internal clearance during mounting by controlling the driving distance onto the tapered seat.