... ,All ball bearing series 2,Good quality,long life 3,Manufactory 4,ISO 9001:2000 certificate Self Aligning Ball Bearing1. The components of the self aligning ball bearings ... common concave sphered raceway.2. This type bearings are self-aligning and insensitive to angular misalignments of the shaft relative ... or, in certain size ranges, with a tapered bore High quality Self aligning Ball Bearing 1215K