This bearing is a 128 Self Aligning Ball Bearing. The outer ring has a spherical raceway and its center of curvature aligns with that of the bearing; therefore, the axis of the inner ring, balls and cage can move to some extent around the bearing center. This type of ball bearing is recommended when the alignment of the shaft and housing is difficult and the shaft may flex. Dimensions of the bearing are 8mm x 24mm x 8mm. This bearing is made of Chrome Steel. you can buy it online at http://www.vxb.com/page/bearings/PROD/Kit7121
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