High Precision / High durability / Low noise Spindle Bearings for machine tools, 7003 / B7003 7003 / B7003, ABEC7/P4 precision, contact angle 15 and 25 avaliable, grease speed 60,000 rpm, oil speed 90,000rpm, Ring and Balls are made from military bearing steel , ceramic balls are avaliable, fiber reinforced phenolic retainer. EXTREMELLY GOOD QUALITY