Needle bearings are a form of cylindrical bearings, in which length of the roller measures at least six times more than it's cross-section. They are undoubtfully the biggest group of ball bearings taking into account design, measurements, variety of types and usage possibilities. Each of their forms has it's characteristic features, however in general needle bearings have major load carrying abilities with comparatively small cross-sections which results in compactness of kinematic pairs; while variety of sizes and types makes possible countless technical solutions.
Contact line between tracks and needles is modified (needles are roll-formed on their ends) what not only eliminates destructive edge stresses but also allows minimum misalignments between shaft and bearing unit. Cages are made of solid steel or steel sheets. In smaller bearings cages may also be made of polyamide reinforced with glass fibre.
Needle Roller Bearings Series
needle rollers bearing can bear greater radial load and there are ones with inner ring and without inner ring. G2 needle rollers are installed, the tolerance of the average diameter is within 2um. Rigidity holders are adopted to correctly lead the needle rollers to be parallel with the axes.
Main Structure Style
| Bearing No. |
Characteristics of Structure |
| NK NKS RNA49 RNA48 |
Double Edge Match of Outer Ring, Single Line, Without Inner Ring |
| NKI NKIS NA49 NA48 |
Double Edge Match of Outer Ring, Single Line, With Inner Ring |
| RNA69 |
Double Edge Match of Outer Ring, Double Lines, Without Inner Ring |
| NA69 |
Double Edge Match of Outer Ring, Double Lines, With Inner Ring. |
| RNA49..RS RNA49..2RS |
Single or Double Surface Airproofing Double Lines |
| NA69.. RS NA69..2RS |
Single or Double Surface Airproofing Double Lines. |
| RNAO |
Outer Ring without capped edge, single line or double lines, without inner ring |
| NAO |
Outer Ring without capped edge, single line or double lines, with inner ring. |
| RNAV |
Double capped edge of outer ring, single line, without inner ring |
| NAV |
Double capped edge of outer ring, single line, with inner ring |
| |
| Series |
Explanation |
| NK |
Non- inner ring needle bearing, light series |
| NKS |
Non- inner ring needle bearing, heavyseries |
| RNA 49 |
Non- inner ring needle bearing, size series 49 |
| RNA 69 |
Non- inner ring needle bearing, size series 69,Pair Row (Odd Row to RNA 6906) |
| RNA 48 |
Non- inner ring needle bearing, size series 48 |
| NKI |
with Inner ring needle bearing, light series |
| NKIS |
with Inner ring needle bearing, heavy series |
| NA 49 |
inner ring needle bearing, size series 48 |
| NA 69 |
Non- inner ring needle bearing, size series 48,Pair Row (Odd Row to NA 6906) |
| NA 48 |
with Inner ring needle bearing, size series48 |
| RNA 49..RS |
with out Inner ring needle bearing,Directly Seal ,Size series 49 |
| RNA 49..2RS |
with out Inner ring needle bearing,One-sided seal ,Size series 49 |
| NA 49..RS |
with Inner ring needle bearing,Directly Seal ,Size series 49 |
| NA 49..2RS |
with Inner ring needle bearing,Two-sided seal ,Size series 49 |
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| Right Part |
Right Price |
| CIE offers ball bearings, tapered roller bearings, needle roller bearings, cylindrical bearings, Spherical Roller Bearings, Thrust bearings, special bearings, Auto bearings, ball screw, linear guide rail and block assembly, Steering gear and parts |
The typical difference between industry bearing and power transmission parts and steering gears and parts from an Original Equipment Manufacturer is the price. CIE sell good at reasonable and fair price to any customer and any country for future and long business relationships in this line |
| Right Quality |
Right Delivery |
| High quality is the name of the game when it comes to bearings,and other auto parts. At CIE we put all of our parts through a rigorous inspection to ensure they meet our high standards. We then back each of part with a two year unlimited mileage warrant. |
As if the savings you'll enjoy on CIE timely delivery for each order, we offer free samples to all of the continental world country. If there is any delay by us. We can use best way to make up for the goods quickly like via by air or by express at our expenses |
If you want to know the bearing item no of above mentioned needle roller bearing. Welcome to contact us
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