... 2.ISO 9001 certified 3.Low noise,Stable in chemic wheel bearing made in china Material: chrome steel STEEL NO.COMPONENTCSiMnCrMoPS CuNiGCr150.95 ... ≤0.025≤0.25≤0.25≤0.3 GCr15 bearing steel compare to same standard code: ChinaISOAISIDINJISSKFGCr15693/XVII52100100Cr6SUJ2SKF3Comparison Sheet ... ,RMS seriesSpecification:1) Open, Z, ZZ, RZ,2RZ,RS, 2RS 2) Clearance: C0, C2, C3 3) Precision Tolerance: ABEC ...