The HFH 7218CDGAP4A is a high-precision single row angular contact ball bearing, designed for demanding applications requiring high speed and accuracy. It features a 90mm inner diameter, 160mm outer diameter, and 30mm width. The 'CD' designation indicates a 15° contact angle, optimized for high radial and axial loads in one direction, often with a polyamide cage for high-speed performance. The 'GA' suffix signifies a universal arrangement, allowing for paired mounting in O, X, or tandem configurations without shims. 'P4A' denotes a high precision class, making it suitable for machine tool spindles and other critical machinery.