cylindical roller bearing size:N,NJ,NU,NUP series cage:cooper and iron cages ... press-fitted. It can be grouped into NU,NJ, NUP,N, NF etc. one-row bearing, and NNU, NN,etc. double ... and raceway are in linear contact5 The NU and N types exhibit their best performance when used as free ... extent, relative to the housing position6 The NJ and NF types carry a certain degree of axial displacement in both ...