Solid ring needle roller bearings are made up of one or two rings and a needle roller group with a cage. Depending on the application, they can be classified as bearings with or without an inner ring. Solid sleeve needle roller bearings can therefore meet the requirements of light weight, small footprint and high power transmission. Solid sleeve needle roller bearings have a small volume and high bearing capacity. Structure type outer circle double retaining edge (or double locking circle) with keep frame needle roller bearing NA, NAV, NKI type can be installed respectively inner circle and outer circle (with locking circle, a full set of needle roller and keep frame), permission speed is high, divided into single and double row two. If the shaft cannot be used as a raceway, i.e. if it is impossible or uneconomical to harden the shaft with grinding, such needle roller bearings with inner rings can be used.
Features NA, NKI type bearings without inner ring that is RNA, NK type needle roller bearings. This kind of bearing without inner ring, suitable for radial installation size restricted support structure, and bearing with the journal directly as a rolling surface. As the rolling surface of the shaft, must be hardened hardware and grinding, and only when it will be processed to the appropriate size and shape accuracy, the whole set of needle roller bearings can be high life and operating accuracy. At the same time, the diameter of the shaft can be increased appropriately due to the absence of an inner ring, thus also increasing rigidity.
Combination type editorial Podcast
Combined needle roller bearing is a combination of radial needle roller bearing and thrust bearing components bearing unit, its compact structure small volume, high rotational accuracy, can bear a very high radial load at the same time bear a certain axial load. And the product structure form various, adaptability, easy to install. Combined needle roller bearings are widely used in machine tools, metallurgical machinery, textile machinery and printing machinery and other mechanical equipment, and can make the mechanical system design is very compact and dexterous. 
Thrust type editorial Podcast
Thrust bearings consist of thrust cage assemblies with needle rollers or cylindrical rollers or balls and thrust washers. Needle and cylindrical rollers are held and guided by the thrust cage. When used in conjunction with different series of DF thrust bearing washers, many different combinations of bearing configurations are possible. The choice of high-precision cylindrical rollers (needle rollers) increases the length of contact and enables high load capacity and high rigidity to be achieved in a small space. Another advantage is that if the surface of the adjacent parts is suitable for the raceway surface can be eliminated when the washer, which can make the design compact, DF thrust needle roller bearings and thrust cylindrical roller bearings using needle roller and cylindrical roller cylindrical surface for the trimmed surface, can reduce edge stress, improve service life.