... .Bearings OEM service 4.ISO9001:2008 HYIB Low Noise Deep Groove Ball Bearings 6313 2RS1. Bearing Material:chrome steel2. ISO9001:2008 certificate3. BearinSg OEM ... Bore diameter(mm) Variant structure61800 10-320 Z,ZZ,RS, 2RS 61900 10-280 Z, ZZ,RS, 2RS, N,NR,ZN,ZNR16000 ... 10-260 6000 10-260 Z, ZZ,RS, 2RS, N,NR,ZN,ZNR 6200 10-220 ...