... 3.Low noise,Stable chemical 2013 High Quality Spherical Roller Bearings Material: chrome steel STEEL NO.COMPONENTCSiMnCrMoPS CuNiGCr150.95 ... ......22320seriesSpecification:1) Open, Z, ZZ, RZ,2RZ,RS, 2RS 2) Clearance: C0, C2, C3 3) Precision Tolerance: ... Level: Z2V1, Z3V2 , Z4V35) Application: Caster bearings, Home Appliance bearings, Electric Motor bearings, 6) Material: Chrome steel 157) Long life ...