1.Single Row Cylindrical Roller Bearing Single row cylindraical Roller Bearing can be classified in NU,NJ,NUP,N,NF and so on .Inner ring outer ring are separeable.It can bear axial load from one direction.It's generally made of dteel stamping or brass cage and some of them are using cage of formed polyamide. 2.Double Row Cylindrical Roller Bearing NNU-design double cylindrical roller bearing.They are separable,which means ring with complete flange,roller and cage can be installed with other rings,or all the bearing components can be installed separately,whjich is favorable for stalling,checking and maintaining.The bearings of NNU-design have a conical bore generally.These bearings are possoble to reach certain radial internal clearance or certain preload. 3.Four Row Cylindrical Roller Bearing Four Row Cylindrical Roller BearingS are almost used for roller neck of mill housing,rollers and rolling machines.Compared with other roller bearing,these bearing are characterized by low friction.They are always interference fitted on roll necks especially application to rolling machineswhich rolling at a high speed. FC:Double outer rings,single inner ring,without ribs. FCD:Double outer rings,double inner rings,without ribs. FCDP:Double outer rings,with center and loose ribs,double inner rings,without ribs Application of Cylindrical roller bearing: Cylindrical roller bearing is widely used for motors ,autos.mill handing machinery and various kinds of industrial machinery, | 
