... .ISO 9001 certified 3.Low noise,Stable chemical 2013 High Quality Spherical Roller Bearings Material: chrome steel STEEL NO.COMPONENTCSiMnCrMoPS CuNiGCr150. ... -3ABEC-5ABEC-7Series: 22205Series,22206Series......22222Series,22308Series,22309Series......22320seriesSpecification:1) Open, Z, ZZ, RZ,2RZ,RS, 2RS 2) Clearance: C0, C2 ...