... flexible High speed limit Low noise Deep groove ball bearings Advantage as below:Bearing the load capacityWith a certain extent of strength ... ,81200,89300,87400,29200,29300,29400series 229200,29300,29400series 3single row, two row, multi-row and six rowRing MaterialGCr15, GCr15SiMn, Chrom steel, 52100Cage materialBrass ...