... 2.ISO 9001 certified 3.Low noise,Stable in chemical 2013 New Taper Roller Bearings Material: chrome steel STEEL NO.COMPONENTCSiMnCrMoPS CuNiGCr150 ... .5-15, Upper H26-48.5-13), etc Specification:1) Open, Z, ZZ, RZ,2RZ,RS, 2RS 2) Clearance: C0, C2 ...