The HFH FPCU408-2RS1 is a precision thin section ball bearing designed for applications requiring compact size and reduced weight. This particular bearing features a bore diameter of 20.638 mm (0.8125 inches), an outer diameter of 28.575 mm (1.125 inches), and a width of 3.969 mm (0.15625 inches). The '2RS1' designation indicates that it is equipped with two rubber seals, providing protection against contaminants and retaining lubrication, making it suitable for various industrial and machinery applications where space is limited and sealing is required.