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The 21309-C3 is a spherical roller bearing with a 45 mm bore diameter from the 213 series, featuring C3 radial clearance for applications requiring greater internal clearance than standard. Spherical roller bearings use barrel-shaped rollers running on a common spherical outer ring raceway, providing self-aligning capability to accommodate shaft misalignment and deflection.
This bearing type is commonly used in heavy industrial applications including mining equipment, construction machinery, paper mills, and gearboxes where misalignment compensation and high radial load capacity are required. The C3 clearance makes it suitable for applications with thermal expansion, interference fits, or operating conditions that reduce internal clearance.
