... , Alvania R12 and so onSeries1.Deep groove ball bearing: 6000series, 6200series, 6300series, 6400 series, 6800 ... 7400series, etc.3.Taper roller bearing: 30000series, 31000series, 32000series, 33000 series4.Spherical roller bearing: 20000series, 21000series, 22000series, ... series, UCF series, UCFL series7.Self aligning ball bearing: 1200series, 1300series, 2200series, 2300series Ring MaterialChrome ...