Self-aligning ball bearing: 1205-1220 1305-1320 2205-2220 2305-2320 and so on
Self-aligning ball bearings are non-separable double-row radial bearings in which both rows of balls can rotate in parallel within a spherical outer ring.
Thus they can provide excellent compensation for misalignments (caused by mounting or machining errors) between the shaft and the housing
