The Nachi 5311ZZ is a double row angular contact ball bearing designed for high-performance applications, featuring a 55 mm bore, 120 mm outer diameter, and 49.2 mm width for robust fit and stability in demanding environments. This bearing offers a 20-degree contact angle, delivering excellent radial and axial load capacity with dynamic and static load ratings of 112,000 N and 86,500 N respectively, ensuring reliable operation under heavy loads. It is double shielded for enhanced contamination protection and uses a pressed steel cage for durability. With a maximum speed of 4,000 rpm (grease) or 5,500 rpm (oil), the 5311ZZ is ideal for industrial machinery, offering precision, longevity, and smooth performance in compact spaces.