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SMF40GWUUE NB 40mm Slide Bush Linear Motion Bushing Bearing Ball Diameter - 9mm it’s built to keep outSMF40GWUUE NB Round Flange Double Wide Type Made in Japan: NB Linear Systems Nippon Bearing Linear Systems SMF40GWUUE NB Round Flange Double Wide Linear Slide Bush, The retainer material is resin, It is seals on both sides, series mainly used in the USA, NB brand (Nippon Bearing Linear Systems), Made in Japan. SMF40GWUUE NB Bearing Linear Slide Bush Bearing Inner Diameter: 40mm Retainer Material: resin Quantity: 1 Bearing Dynamic load rating Cr: 3430