SKFbearing 5309 Brand:SKF,NTN,NSK,XRT(domestic) Quality standard:ISO9001:20000 Satisfactory qualiy,sevice SKF bearing 5309low vibration,low noise,low friction ... ,non-standard and special bearings.1.Bore diameter:3mm-50mm2.Bearing range:60series:606,607.608,6000,6001,6002,6003,6004 ... ,home appliance motors,motorcyles,power tools,sports goods,office appliance cylindrical roller bearing