... Groove Ball Bearings ,Cylindrical Roller Bearings, Self-aligning ball bearings, Tapered Roller Bearings, Thrust Roller Bearings, Spherical Bearings, Needle Roller Bearings, Linear Bearings, Miniature Bearings.... TianRui bearings are generally used ... SeriesSeries 30200, 30300, 32200, 32300, 33000, etc. Ring MaterialChrome Steel ,Carbon steel,Stainless steel Tolerance gradeGB/T307.1-205 ID Size ...