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SMSK30W 30mm Slide Bush Bushings Motion Linear Bearing Thin Sealed Bearing The inner diameter is 7/8"SMSK30W Square Flange Double Anticorrosion wide Slide Bush Made in Japan: NB Linear Systems Nippon Bearing Linear Systems SMSK30W Square Double wide Anticorrosion Linear Slide Bush, The retainer material is steel, series mainly used in the USA, NB brand (Nippon Bearing Linear Systems), Made in Japan. SMSK30W Bearing Linear Slide Bush Retainer Material: Steel Bearing Inner Diameter: 30mm Quantity: 1 Bearing Dynamic load rating Cr: 2490 N Static load