... ,51300,Inch and metric series etc.MaterialChrome Steel ,GCr15,Carbon steel,Stainless steelNoise standardZ1, Z2, Z3, Z4Quality standardISO 9001:2000Precision RatingP0,P6,P5 ... SBR Bearing Manufacturing Co., Ltd. is a specialized enterprise for the production of tapered roller bearings, deep groove ball bearings, self-aligning roller bearings, outside spherical bearings, thrust bearings ...