... ) 2, Steel plat(NA, TAF, TAF=NK) Medium and Large Sized Needle Roller Bearings :Two types:1, ... & broad series, with or without inner races, cages, ribs or sealings. It can be designed according ... steel, quench-hardening HRC61---65.Material for cages is quality low-carbon steel or reinforced nylon ... thermal fitting of the bearing.Limited by plastic cages (suffixed with TN) and sealing-element material, ...