Miniature ball bearings Miniature ball bearing Ball screws actuators MINIATURE BALL BEARINGS From miniature ball bearings no larger than the head of a match to giant slewing ring bearings with outside diameters in excess of 16 feet, NSK products are designed for high accuracy, rugged dependability, and minimum maintenance. From bearings for aircraft engines and machine tools, to “sealed-clean” bearings for automobiles and rolling mills, to bearings for computers and home appliances, NSK delivers quality the world over.