This type of ball bearing is recommended when alignment of the shaft and housing is difficult and the shaft may flex. The outer ring has a spherical raceway and its centre of curvature coincides with that of the bearing; therefore, the axis of the inner ring, balls and cage can deflect to some extent around the bearing centre. Pressed steel cages are usually used. Since the contact angle is small, the axial load capacity is low. The permissible dynamic misalignment is approximately 0.07 to 0.12 radian (4 to 7 degrees) under normal loads. However, depending on the surrounding structure, such an angle may not be possible. Self-aligning ball bearings have two rows of balls, a common sphered raceway in the outer ring and two deep uninterrupted raceway grooves in the inner ring. They are available open or sealed. The bearings are insensitive to angular misalignment of the shaft relative to the housing, which can be caused, for example, by shaft deflection. Specifications Design: Tapered bore. Bore diameter d: 80mm. Outside diameter D: 140mm. Width B: 33mm. Width outer ring C: 33mm. Shoulder diameter inner ring d1: 99mm. Shoulder diameter outer ring D1: 125.2mm. Protrusion of the balls from bearing side faces C1: 0mm. Chamfer dimension r1,2min: 2mm. Tapered bore, taper 1: X: Tapered bore, taper 1: 12. Abutment diameter shaft Da min: 91mm. Abutment diameter shaft Da max: 99mm. Abutment diameter housing Da max: 129mm. Fillet radius Ra max: 2mm. Basic dynamic load rating C: 65kN. Basic static load rating C0: 25.5kN. Fatigue load limit Pu: 1.3kN. Reference speed: 8500r/min. Limiting speed: 6000r/min. Calculation factor kr: 0.045. Calculation factor e: 0.22. Calculation factor Y0: 2.8. Calculation factor Y1: 2.9. Calculation factor Y2: 4.5.