... ,RNAV, NAV 1) ISO9001-2000 GCR15 material 2) Good quality Needle Roller Bearing NK, NKI,NKIS, NA, RNA,RNAO,NAO,RNAV, NAV1) ISO9001 ... , and surface roughness.NKI,NAThe inner ring has no shoulder in this bearings. For this purpose, the inner ring, outer ring ... /12NA 4900NA 6900NK5/10TNNKS 8 TNRNA 4900RNA 6900NKI 10/16NA 4901NA 6901NK6/10TNNKS 10 TNRNA 152815RNA 6901NKI 12/20NA 4902NA 6902NK6/12TNNKS ...