1220K+H Self Aligning Ball Bearing with Adapter Sleeve 90x180x34mm1220K+H Self Aligning Ball Bearing with Adapter Sleeve 90 x 180 x 34 mm 1220K+H Self Aligning Ball Bearing, Bearing has spherical outer race where the balls and cage continue to rotate, this type of bearing is suitable when the displacement of the center around which the shaft and housing rotate and shaft deflection is likely to occur. made from durable 52100 alloy steel, commonly known as chrome steel. Bearing is tapered with adapter sleeve. 1220K+H