... ,521002. Cage(Retainer):Brass cage,nylon cage,steel cage3. Production standard:GB307, DIN6204. Quality insurance: Same as samplesCatalog index:Characteristic of ... roller bearings, NKI, NANeedle roller bearings, flanges, without inner ring, RNAO, RNAO, ZWNeedle roller bearings, flanges, with inner ring, NAO...ZWNeedle roller bearings ...