... 3)20 years manufacturer 4)ISO9001:2000certificate. Ball thrust bearing 51230 Features:1) Good quality, competitive prices .2) Widely used ... 51200 series, 51300 series and 51400 seriesTypeSingle-direction thrust ball bearing,Double-direction thrust ball bearing,Single-row thrust ball bearing,Double-row thrust ball bearing,Auto bearingID Size150-670mmMaterialGCr15,GCr15SiMn,50Mn,42CrMoCage ...