... steel 5.Warranty:one year 1.NN 3005 Cylindrical roller bearing/roller bearing NN 3005--NN 3010NN 3011--NN 3019NN 3020NN ... SKF/NACHI and other Chinese brands.3.Features:Cylindrical roller bearing mainly bears radial load.Small friction coefficient, ... cylindrical roller bearing: N, NU, NJ, NF, NUP, NFP,NH(NJ+HJ)Double row cylindrical roller bearing: NN, NNU, NNF,Multi-row cylindrical roller bearing: ...