FYH Bearing UCP321 105mm Pillow Block Mounted BearingUCP321 FYH Bearing Pillow Block Bearing Cylindrical bore (with set screws) 105mm Inner Diameter This is the most common type of mounted ball unit. The rib at the bottom of the housing mounting section provides for a robust unit that can withstand great loads from any direction. Mounted units with cast steel housings are also available in this series, and are used for applications with severe loading and shock load conditions. Tapered bore style units