taper roller bearing 2. Material, steel GCR-15 3.Quality authentication ISO9001:2000 4.Hardness:62-65 plastic tapered tubes taper roller bearing Greese/OilAs you requirement, such as SRL ,PS2, Alvania R12 and so on SeriesSeries 30200, 30300, 32200, 32300, 33000,6000,6200,6300,6400,51100,51200,51300,51400,DAC,BC, etc. Ring MaterialChrome Steel ,Carbon steel,Stainless steel Tolerance gradeGB/T307.1 ...