Single Row Deep Groove Ball Bearing 626,627,628,629,6200,6201,6202,6203,6204  Material:Chrome steel (Gcr15) 1.Feture of deep groove ball bearing/6204: 6000 series: 607,608,609,6000,6001,6002,6003,6004 with Open,Z,ZZ,RS,2RS,NR,NR 6300 series: 6301,6305 with Open,Z,ZZ,RS,2RS,NR 6900 series: 6900,6901,6902,6905 with Open,Z,ZZ,RS,2RS,NR Deep Groove Ball Bearing with Open, Shield(ZZ), Sealed (2RS)