The cylindrical roller bearings are usually separable bearings.these bearings are only used to carry radial loads.they can carry much greater radial loads and can be allowed to rotate in much higher speed.the cylindrcal roller bearings can be divided into single row,double rows,three rows,four rows and so on. We can produce: Single row : NU,NJ,NUP,N,NH(HJ+HJ),NF,NFP,RNU,NR,etc; Double rows: NN,NNU,etc; Four rows :FC,FCD,FCDP,etc.