NSK 1308J Double Row Self Aligning Ball Bearing

• The outer ring has a spherical raceway and its centre of curvature coincides with that of the bearing
• The axis of the inner ring, balls and cage can deflect to some extent around the bearing centre

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.