... limiting speet Cylindrical roller bearing N,NN,NJ.NU.NF etc series/China bearing,lower nosie and high ... .Model Number: 60xx, 62xx, 63xx, 64xx, 16xxx, 16xx, R series, etc 4.Quality: ABEC-1, 3, 5, Z1V1 ... quality bearing Cylindrical roller bearing N,NN,NJ.NU.NF etc series/China bearing,lower nosie and high ... bearing Cylindrical roller bearing N,NN,NJ.NU.NF etc series/China bearing,lower nosie and high ...