This bearing supports the threshing drum shaft within the threshing mechanism of a grain harvester. It is a self-aligning, double-row ball bearing with a tapered bore and C3 internal clearance, designed to accommodate the radial and axial loads generated during threshing while allowing for minor shaft misalignment. A worn bearing produces audible rumble or vibration from the drum area and can lead to shaft scoring if not replaced promptly. The original-equipment bearing matches the shaft journal diameter and housing bore of the assembly, so no adapter sleeves or shims are required for installation. On reinstall, ensure the locking collar is tightened to the manufacturer's torque specification.