... N, NF,NN 3.Cage material:brass,steel,nylon Cylindrical Roller Bearings Cylindrical roller bearing is separable bearing,the inner ring and outer ... with low fricition and high limit speed.Double row cylinder roller bearing has the advantage of compact structure ,high ... .,it be used for machine spindle application.Most four rows cylinder roller bearings are used cooling and hot mills. 1materialGCr15SiMn, ...