1218 Self Aligning Ball Bearing 90x160x30mm1218 Self Aligning Ball Bearing 90mm x 160mm x 30mm 1218 Self Aligning Ball Bearing has a spherical outer ring raceway, the balls and cage continue to rotate, this type of bearings is suitable when the displacement of the centers around which the shaft and housing rotate and shaft deflection are likely to occur, made from durable 52100 alloy steel, commonly known as chrome steel. 1218 Ball Bearing Self Aligning Bearing Dimensions: 90mm x 160mm x 30mm