NB SW8UU 1/2 inch Seals Ball Bushings Linear MotionSW8UU Seals on both sides NB Nippon Bearing Linear Systems Made in Japan SW8UU 1 2" Bore linear motion ball bushing bearing, SW8UU is Seals on both sides, the innerdiameter(bore) is 1 2" inch dimensions with steelretainer, bearing is high accuracy grade linear bushing, series mainly used in the USA, NB brand (Nippon Bearing Linear Systems), made in Japan. Item: SW8UU NB Ball Bearing Type: Nippon Bearing Linear System Number of ball circuits: 4 Size: 1