This insert ball bearing has a spherical outer ring surface, allowing it to seat in a housing and self-align, with the inner ring secured to the shaft by means of an adapter sleeve rather than a direct bore fit. The outside diameter is 150.0 mm, the width is 48.0 mm, and the net mass is 3.9 kg. Sealing is provided on both sides by 2RSR seals, protecting the internal raceway and ball complement from contamination while retaining grease within the bearing. The adapter sleeve mounting method permits fitting at any point along a plain shaft without requiring a stepped or precision-ground seating diameter, simplifying installation and shaft machining. The spherical outer ring compensates for slight misalignment between the shaft and housing bore, while the double-sided seal arrangement supports grease lubrication and reduces the need for frequent relubrication in applications where ingress of dust or moisture is a concern.