Needle bearing is one kind of bearing with cylindrical rollers that are small in diameter relative to their length and very thin. Needle roller bearing modified roller/raceway profile prevents stress peaks to extend bearing service life. And it has a higher load bearing capacity but a small section, therefore, it’s suitable for the occasion of limited radial space. 

Needle bearings can be divided into the various categories according to their structure，and these following kinds bearings usually can be used in general engineering:
（1）Stamping outer ring needle roller bearing, whose outer ring is made of sheet metal precision stamping, and have open type and seal type two kinds. Full needle, low section height is, restricted installation space, little structure space is, but higher load capacity.
（2）The solid ring needle roller bearing is composed of one or two rings and a needle roller group with a cage, can be divided into two kinds of bearings with and without inner ring. Therefore, solid ring needle roller bearings can meet the requirements of light weight, small space occupation and large power transmission.
（3）Combined needle roller bearing is a bearing unit formed from centripetal needle bearing and thrust bearing components, which can bear radial load at the same time absorb a certain amount of axial load as its compact structure, small volume, and high precision rotation. These bearings are diversified structure, better adaptability and easy installation, etc. 
（4）Thrust bearing consists of thrust washer and thrust cage assembly with needle rollers, cylindrical rollers or balls. Needle rollers and cylindrical rollers are held and guided by thrust cage assemblies. This kind bearings have the characters of compact design, low edge stress and long service life.

RONA Bearings supply needle roller bearings in many different designs, series and in a wide range of sizes, which makes them appropriate for a wide variety of operating conditions and applications according to different occasions. Needle bearings are mainly used in machine tools, metallurgy machinery, textile machinery, printing machinery, automobiles and motorcycles gearboxes, textile machinery, aircraft frames, missiles main wings and other compact and nimble mechanical system.

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