X-type four-point contact ball bearings - JG series (double-sided sealing) feature a four-point contact raceway design with integrated high-temperature rubber seals on both sides, supporting bidirectional axial loads while providing reliable sealing performance in elevated temperature environments. Available in double-sealed configurations only, with bore diameters ranging from 20mm to 250mm. These bearings deliver compact design, high axial rigidity, high-temperature sealing stability, consistent grease retention under thermal stress, and maintenance-free operation in heat-intensive applications, making them ideal for industrial oven slewing rings, drying equipment turntables, heat treatment systems, semiconductor manufacturing equipment, exhaust system components, and high-temperature processing machinery where both sealing and thermal resistance are critical.