260 mm x 320 mm x 28 mm 260 mm x 320 mm x 28 mm NBS SL181852 NBS Bearing

What is 260 mm x 320 mm x 28 mm 260 mm x 320 mm x 28 mm 260 mm x 320 mm x 28 mm NBS SL181852 NBS Bearing in mechanical engineering? NBS Bearing RBC BEARINGS Brand Manufacturing Service . Upload your CAD file UBC Mechanical Electronic Instrument Co., Ltd. for an instant. Bearing Noun

What is SL181852 bearing interchange？