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Precision Deep Groove Ball Bearings ( EMQ Bearings ) 6903 Bearing Designation Open Seals 6903 d 17 D 30 B 7 r1 0.3 Cr 4.6 Cor 2.55 Grease 23000 Oil 28000 da 19 Da 28 Mass(kg) 0.018 Introduction WD ...