... .Quality:ISO9001:2000 certificate 2.Large sales make our prices super low. high precision bearing,ball bearings,roller bearings:A: Inner Ring Bore ... ), R-Flange(FRxxx),C: Models: OPEN, RS, 2RS, RZ, 2RZ, Z, ZZ, N, M are all available.D: Precision Grade: P0, P6 ... : Raw Material: Gcr15 Chrome Steel, Stainless Steel AISI440C, Ceramic Si3N4. high precision bearing