... types: Deep 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 ... ,Carbon steel,Stainless steel Tolerance gradeGB/T307.1-205 ID Size 10mm~280mm Quality standardISO 9001:2000 standard Precision P0,P6 ...