Needle Roller Bearing NK, NKI,NKIS, NA, RNA,RNAO,NAO,RNAV, NAV 1) ISO9001- ... 2000 GCR15 material 2) Good quality Needle Roller Bearing NK, NKI,NKIS, NA, RNA,RNAO,NAO,RNAV, NAV1) ISO9001-2000 ... 4924 NK55/25 RNA 4828 NK60/25 RNA 4928 NA,NK Needle Roller Bearing