MRC self-aligning bearings have two rows of balls with a common sphered raceway in the outer ring. This gives the bearings their self-aligning property, permitting angular misalignment of the shaft relative to the housing. They are therefore particularly suitable for applications where misalignment can arise from errors in mounting or from shaft deflection. MRC non-sealed self-aligning ball bearings have the lowest friction of any bearing type. SKF® Self Aligning Ball Bearing, Series: 1200, 25 mm Bore Dia, 52 mm Outside Dia, 2 Rows, 15 mm W, Open Closure, 14.3 kN Dynamic/4 kN Static, Steel Bearing, Plastic/Fiberglass Reinforced Nylon Cage, 28000 RPM Maximum, Uncoated