High quality bearing NA 4903 needle roller bearings with inner ring NA49003-UU 17*30*13mm

FOB Reference Price:Get Latest Price
$1.50 - $6.00 / Set | 1 Set/Sets (Min. Order)
Outside Diameter:
Support Sea freight
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Quick Details
Bore Size:
0.1 - 17 mm mm
Brand Name:
Model Number:
NA 4903
Precision Rating:
P0 P6 P5 P4 P2
Seals Type:
Number of Row:
Single Row
Place of Origin:
Needle Roller Bearing NA 4903 Cage:
IKO Roller Bearing NA 4903 Vibration:
V1 V2 V3 V4
OEM Service.Design Service
Bearing Stock:
Large Stock
Chrome Steel GCr15
Long Life
P0 P6 P5 P4 P2
IKO Roller Bearing NA 4903
Supply Ability
Supply Ability:
100000 Set/Sets per Month IKO Roller Bearing NA 4903
Packaging & Delivery
Packaging Details
IKO Roller Bearing NA 4903 with High Performance IKO Inch Needle Roller Bearing NA 4903 Package:
Individual paper box+paper carton+wooden pallet

High quality bearing NA 4903 needle roller bearings with inner ring NA49003-UU 17*30*13mm

Needle Roller Bearing NA4903

Brand Name

IKO Bearing or according to your requirement

Item Name

Needle Roller Bearing NA 4903

Bearing Sizes





Chrome steel, Gcr15



Cage Type

Brass Cage,Steel Cage,Nylon Cage


50000km Or One year

Delivery Detail

2-10 days upon receipt of deposit


Express: DHL Fedex EMS  /By Sea


Gearbox,Trucks,Trailers,Automobiles,Rolling Mill,Metallurgy,Plastics Machinery

Bearing Advantage

1).Excellent and high quality control

2).Prompt delivery

3).Competitive price

4).Small order accepted

5).Customers' drawing or samples accepted

6).OEM service


Needle Roller Bearing Photo

1.The Description of Needle Roller Bearings:

Needle roller bearing type belongs to the separation bearing, have needle roller bearing inner and outer race. According to these bearings on the column number of the needle is divided into single row, double row and four row circular cone needle bearings of different structure. Single row circular cone needle bearings can bear radial load and the single direction axial load. When bearing radial load, axial force component, would create a so when need another affordable bearing axial force in the opposite direction to balance.

Needle roller bearing is mainly used to bear the joint mainly consisting of radial load and axial load. Compared with the angular contact ball bearing, large carrying capacity, limit rotational speed is low. Needle roller bearings can withstand axial load in one direction, can limit axial displacement of shaft or housing in one direction.  

2.The Advantage of Needle Roller Bearings:

1.Strong abrasion capability 

2.Competitive price 
3.Low cross section. Low Noise and long life 
4.High Precision and load capacity. 
5.Various types are available 
6.Reliable quality 
7.OEM is accepted 
8.Various design and Widespread use.

3:The definition of Needle Roller Bearings:

Capacity single row needle roller bearing axial load depends on the contact angle, the outer ring raceway angle, the greater the angle, the greater the axial load capacity. Needle roller bearings is the largest amount of single row needle roller bearings. In the car's front wheel hub, and use the small size of the double row needle roller bearings. Four-row needle roller bearings used in large-scale cold rolling mill and other heavy machines.

4:The Application of Needle Roller Bearings:

Needle roller bearings are widely used in automotive, mill, mining, metallurgy, plastics machinery and other industries.

5:Related Needle Roller Bearing Catalogue
ShaftDesignationMassDimensionsBasic Load RatingsLimitingOriginal
Diameter  dFDBrCrCorSpeedDesignation
mm g    min.kNkNrpm 
10NA 490023.0101422130.38.69.2200004544900
12NA 490126.0121624130.39.610.9170004544901
15NA 490234.0152028130.310.813.9140004544902
17NA 490337.0172230130.311.615.4120004544903
20NA 490475.2202537170.320.925.1110004544904
25NA 490588.0253042170.323.530.795004544905
30NA 4906101.0303547170.325.535.480004544906
35NA 4907170.0354255200.632.551.070004544907
40NA 4908230.0404862220.643.466.160004544908
50NA 4910274.0505872220.648.080.050004544910
60NA 4912426.0606885251.066.4119.643004544912
65NA 4913456.0657290251.067.6124.641004544913
70NA 4914728.07080100301.091.8169.938004544914
SaiFan Advantage


– At the beginning, we will have a communication with our customers on their demand, then our  engineers will work out an optimum solution based on the customers’ demand and condition.

– Running in accordance with ISO 9001 quality system, the advanced production equipments,  sophisticated processing technology, strict quality management system, skilled workers and innovative technical team, make our bearings in continuous quality improvement & technology development.

- In accordance with ISO standards, we have professional Q/C staff, precision testing instruments and internal inspection system, the quality control is implemented in every process from material receiving to products packaging to ensure our bearings quality.

– Standardized export packing and environment-protected packing material are used for our bearings, the custom boxes, labels, barcodes etc. can also be provided according to our customer’s request.

 – Normally, our bearings will be sent to the customers by ocean transportation due to its heavy weight, airfreight, express is also available if our customers need.

– We warrant our bearings to be free from defects in material and workmanship for a 12 months period from the shipping date, this warranty is voided by non-recommended use, improper installation or physical damage.

About US

High Quality Bearings, Choose Saifan.
Jinan Saifan Bearing Co., Ltd is a professional bearing manufacture located in Jinan, Shandong.

We are established in year 2005 and we have 10 years experience in bearing manufacture.
We mainly produce wheel hub bearings, ball bearings, roller bearings etc.


Our Workshop


Saifan Exhibition 
Express & Payment


Q:What’s your after-sales service and warranty?

A: We promise to bear the following responsibility when defective product is found:

1.12 months warranty from the first day of receiving goods;

2. Replacements would be sent with goods of your next order;

3. Refund for defective products if customers require.


Q:Do you accept ODM&OEM orders?

A: Yes, we provide ODM&OEM services to worldwide customers, we are able to customize housings in different styles, and sizes in different brands, we also customize circuit board & packaging box as per your requirements.




Q:How to place orders?

A: 1. Email us the model, brand and quantity, consignee information, shipping way and payment terms;

2. Proforma Invoice made and sent to you;

3. Complete Payment after confirming the PI;

4. Confirm Payment and arrange production.



Jinan SaiFan Bearing Co,.Ltd

Add: Business Center,No.88 Dikou Rd,
Tian Qiao Dist, Jinan, China.
Skype: saifan005

High quality bearing NA 4903 needle roller bearings with inner ring NA49003-UU 17*30*13mm

High quality bearing NA 4903 needle roller bearings with inner ring NA49003-UU 17*30*13mm

High quality bearing NA 4903 needle roller bearings with inner ring NA49003-UU 17*30*13mm