X-type four-point contact ball bearings - 8mm series feature a miniature four-point contact raceway design with a single inner ring and split outer ring configuration, engineered to support bidirectional axial loads and moderate radial loads in an ultra-compact package. Available in open configurations only, with a fixed bore diameter of 8mm and a cross-section height of 8mm. These bearings deliver compact design, high axial rigidity, space-saving installation, and reliable bidirectional load capacity, making them ideal for miniature slewing rings, small robot joints, precision optical mounts, micro-positioning stages, miniature rotary tables, and compact automation equipment where both axial load capacity and space efficiency are critical.