... 5.ISO 9000/9001/9004/19011: 2000 NUTR series are equipped with caged roller assemblies. All other ... : K, ZW, KD, ZWD, KZK, KBK and KNL series 4. Heavy duty roller bearings: NK, NKS, RNA49, RNA69 ... , K874, K893, K894, AS and GS811 series 7. Track type track rollers: STO, RSTO, NA22, 2RS, RNA22, 2RS, NATR, ... NATR, PP, NUTR, KR, KR, PP, KRV, KRV, PP and NUKR series Our ...