nsk/skf cylindrical roller bearing NU228 1.Size:N,NU,NJ,NF,NUP,NNseries,etc. 2.reference price: US$2.50-500.00 3.ISO: 9000 nsk/skf cylindrical roller bearing NU2281.Types:Nseries,NNseries,NUseries,,NJseries,NUPseries,NCFseries,etc.2. Material: Gcr15-China,(AISI)52100-USA,(DIN)100CR6-Germany3. Retainer: J, K, M, MA, MB, ML, MP, MR4. Clearance: CN, C2, C3, C4, C55. Precision level:ABEC-1,ABEC-3, ...