50x80x20 mm ZKL 51210 thrust ball bearing is designed to carry axial load in one direction. It is used where force acting along the shaft axis must be reliably supported.
40x80x18 mm FLT 1208 self-aligning ball bearing with two rows of balls compensates minor shaft-to-housing misalignment. It is intended mainly for radial loads and limited axial loads in both directions.