NACHI 4 Pack 6306-2NSE9 Bearing 6306-2NSE Seals 6306-2RS Bearings 6306 RS Japan. Dimension: 30x72x19 mm, Made in Japan, Deep Groove Ball Bearings. 6306 - 2nse9 Deep groove Nachi bearing - high quality 2 side rubber seals. Dimension: d (Inside) Bore 30 mm D (Outside) 72 mm B (Width) 19 mm This Nachi 6306 - 2NSE9 ball bearing is made of chrome bearing steel and has 2 rubber seals. It has a 30 mm inside diameter, a 72 mm outside diameter, and a 19 mm depth. Rubber seals on both sides of the bearing help retain lubricant and exclude contaminants. This deep groove ball bearing is used in applications such as electric motors, compressors, and material handling equipment, among others.