The radial needle roller and cage assembies is an independent bearing component, without the ferrule. Suitable in the supporting sturctures whose radial installation dimensions are restricted,the axie neck surface and the shell hole surface matched with the bearing directly taken as the bearing‘s inner and outer rolling surfaces.it has the advantages of small volume,light weight,large load capacity and high rigidity,etc. in which every needle is precisely guided and maintained by the cage. It can be divided into two structures :the single row(type:K inner dia. X outer dia. X width)and the double rows(Type:K inner dua. X outer dia. X width ZW).Generally used in the places of gearboxes and the engine connecting rods of the automobiles, tractors and the engineering machineries,etc.