SKF NU-2211-ECJ Cylindrical Roller Bearing

SKF NU2211-ECJ is a single-row cylindrical roller bearing with a bore of 55 mm, an outer diameter of 100 mm, and a width of 25 mm, placing it in SKF's 55x100x25 mm family designed for compact, high-load radial support. The ECJ designation indicates a fixed outer ring, while the inner ring remains free to rotate and can slide in both directions to maintain alignment under load, delivering stable performance in demanding machines. The bearing uses steel cylindrical rollers and provides normal internal clearance (C0), balancing running clearance with load capacity for reliable operation. The cylindrical roller design distributes load across multiple rollers along a line contact, enabling high radial load capacity and stiffness in rotating assemblies, which is why the NU series is commonly specified for machine tools, gearboxes, and other equipment where rigidity and precision are paramount. Variants such as NU2211 ECJ/C3 exist to offer higher internal clearance when required by specific operating tolerances or misalignment conditions, while retaining the same basic geometry and mounting footprint.