X-type four-point contact ball bearings - KG series feature an ultra-heavy-duty four-point contact raceway design with reinforced cage construction and oversized rolling elements, engineered to support extreme axial loads and heavy radial loads while maintaining bidirectional load capability and exceptional moment rigidity under the most demanding conditions. Available in heavy-duty single-row and double-row configurations, with bore diameters ranging from 80mm to 800mm. These bearings deliver maximum axial load capacity, superior shock load resistance, extended service life in extreme conditions, and exceptional structural rigidity, making them ideal for large wind turbine main shaft systems, giant excavator slewing rings, offshore crane turntables, heavy steel mill equipment, and ultra-large-scale material handling systems.