SW8GWUU 1/2 inch sealed on both sides Linear MotionSW8GWUU: Made in Japan: NB Linear Systems Nippon Bearing Linear Systems SW8GWUU NB Systems Ball Bushings Linear Motion, 1 2" Bore linear motion ball bushing bearing, the inner diameter(bore) is 1 2" inch dimensions with a resin retainer series mainly used in the USA, Bearing has 2 Seals, NB brand (Nippon Bearing Linear Systems), made in Japan. Item Number of ball circuits Dimensions(Inches) Eccentricity radial clearance basic load rating dr D L B W D1