NA4905 2RS Needle roller bearings 25x42x18mm

Model: NA4905 2RS
Place of Origin: Zhejiang,China (Mainland)
Number of row: Single row
Type: Roller bearing
Material of race: ST14
Material of Needle roller: Chrome steel
Precision: P6


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Product Description

Payment & Shipping Terms Supply Capacity
Trade Term:FOBProduction Capacity:50000 Piece/Pieces per...
Payment Terms:L/C, T/T, WUPacking:RNB OR NATURAL
Min. Order:1000 Piece/PiecesDelivery Date:35days
Means of Transport:Ocean, Air

Seal Ring Needle Roller Bearings NA4905 2RS

Demension: 25×42×18mm ,    Weight: 89.5g.


The solid collar needle roller bearing has compact structure, small radial size and large load carrying capacity. It is suitable for the parts of which the radial overall size is limited. It is also wide applied to the situation where the shaft or housing has the swinging motion. In general, the needle roller bearing only withstands the radial load, not the axial load. When the shaft has axial load, it can be used in combination with other bearings. However, it does not limit the axial shift of shaft or housing. The limiting rotational speed of needle roller bearing is lower. In high rotational speed of main machine, the needle roller bearing with cage shall be chosen as far as possible. In compassion with other types of needle roller bearings, under the situation of same radial size, the needle roller bearing has the large load carrying capacity and high rigidity but has high friction torque.

This kind of bearing has many series with different structure and size. It is requested that the hardness, processing accuracy and surface roughness of shaft journal surface and rolling surface of outer housing be same as those of the collar of bearing. As for the needle roller with G2 class, the diameter varies within 2µm in group. Except the full complement needle roller bearings, they have the rigid cages, which can correctly guide the parallel axis line of needle roller. The needle roller bearing without inner ring is suitable for the parts of which the radial size is limited. Because of no inner ring, the surface of shaft journal fitted with it is acted directly as rolling surface. It is    rquested that the surface hardness be no less than HRC60, surface roughness, no more than 0.63µm. This kind of bearing does not limit the axial shift of shaft and housing and has high limiting rotational speed.

The inner ring has no shoulder in this bearing. For this purpose, the inner ring, outer ring, complete set of needles and cage can be mounted respectively. This bearing does not limit the axial shift of shaft and outer housing. Since the cage separates the needles so as to reduce friction. It can be used for the parts with high rotational speed.

Seal Ring Needle Roller Bearings NA4905 2RS

Including the models of RNA...RS, RNA...2RS, NK...RS, NK...2RS; NA...RS, NA...2RS; NKI...RS, NKI...2RS.

The seal ring needle roller with inner ring or without inner ring is the solid collar needle roller bearing

equipped with single side or double side synthetic rubber seal ring to ensure long-term lubricating function

RNBBearing DesignationBoudary DimensionsBasic Load RatingLimiting Speed
ShaftNA 49..RSNA 49..2RSdFWDCBDynamicStaticOil
10NA4900 RSNA4900.2RS10142213146800690013000
12NA4901 RSNA4901.2RS12162413147600830012000
15NA4902 RSNA4902.2RS152028131486001030010000
17NA4903 RSNA4903.2RS17223013148800110009000
20NA4904 RSNA4904.2RS202537171817300199007500
25NA4905 RSNA4905.2RS253042171819300242006500
30NA4906 RSNA4906.2RS303547171821100285005500
35NA4907 RSNA4907.2RS354255202126500395004800
40NA4908 RSNA4908.2RS404862222336000530004200
45NA4909 RSNA4909.2RS455268222338000590003900
50NA4910 RSNA4910.2RS505872222340000640003500

Seal Ring Needle Roller Bearings NA4905 2RS

Category: The Solid Collar Needle Roller Bearings

Related Category: The Drawn Cup Needle Roller Clutch  Without Cage Needle roller Bearings  Drawn Cup Needle Roller Bearings  Thrust Needle Roller Bearing  Curve Roller Bearings