SKF 1218/C3 Self-aligning ball bearing SKF Self Aligning Ball Bearing have two rows of ball, a common sphered raceway in the outer ring & two deep uninterrupted raceway grooves in the inner ring. The Bearing are self aligning like Spherical roller Bearing or CARB bearing with Excellent high speed perfomance, Minimum maintence, Low Friction, Excellent light load performance and Low Noice