... of roller's number for the different cage bearing . SL Cylindrical Roller Bearings are heavy series full complement double row ... There are two types: one has unfixed end (Series SL 01 and Series SL04), The other has fixed end (Series ... NKS, RNA 49, RNA 69, RNA 48, NKI, NKIS, NA 49, NA 69, NA 48,RNA 49-RS, RNA 49-2RS, ... ,NATR,NATV,NAST,STO,RSTO high quality original SL series Cylindrical Roller Bearings