... long life 4.Prompt delivery,OEM service needle bearing: Needle roller bearings have a high load carrying capacity in addition to ... ,NA49 RS , NA49 2RS ,NAO , RNAO , RNAV ,NAV series4) Thrust roller and cage assemblies : AXK , AXW ,K811. K812, K871 . K894 sries5 ... guidance : RSTO series6) Yoke type track roller with guidance :NATR ,NUTR,MUTR series7) Stud type track roller : KR , KRV ,NUKR series we ...