ISO9001&TS16949certified OEM for German&Japan R&D capability CMM & FOUNDRY MASTER for quality control long life &low noice deep groove ball bearing Features and specification of TLD bearingSeries 1618**,628**,619**,629**,16***,6000Ring MaterialGCr15, GCr15SiMn, Chrom steel, 52100Cage materialBrass, steelID size100mm— 2200mmQuality standardISO9001:2000 and ISO9001:2000/ISO14001:2004, ...