The HFH B7004ETP4SUL is a high-precision angular contact ball bearing, specifically designed for machine tool spindles and other applications requiring high rotational accuracy and rigidity. This bearing features a 20 mm inner diameter, 42 mm outer diameter, and 12 mm width, conforming to the B7004 series specifications. It is manufactured to P4S accuracy class, indicating very high precision suitable for demanding industrial environments. The 'E' suffix typically denotes an optimized internal design for increased load capacity, 'T' for a phenolic resin cage, and 'P4S' for the accuracy grade. This bearing is a critical component for maintaining precise spindle operation.