... ,51100,51200,51300,Inch and metric series etc.MaterialChrome Steel ,GCr15,Carbon steel,Stainless steelNoise standardZ1, Z2, Z3, Z4Quality standardISO 9001:2000Precision ... has formed a complete system of production, marketing and service.main production model:Tapered roller bearings:1TYPE: Single Row Tapered Roller Bearings: 32000 ...