Specifications

Word famous brand needle bearing NA4903
1.Samples are available
2.Delivery in time
3.Wide range of use
4.Competitive price

Word famous brand needle bearing NA4903

 

1.Types of Designs:

 

This kind of bearing has multiple structural styles for the choice of customers, such as narrow & broad series, with or without inner races, cages, ribs or sealings. It can be designed according to the special structural requirements of customers as well.

 

2.Description:

 

Needle bearings have a large surface area that is in contact with the bearing outer surfaces compared to ball bearings. Additionally there is less added clearance (difference between the diameter of the shaft and the diameter of the bearing) so they are much more compact. The typical structure consists of an a needle cage which orients and contains the needle rollers, the needle rollers themselves, and an outer race(sometimes housing itself).

 

 

3.Product Precision Accuracy:

 

• Dimensional tolerance and geometrical accuracy is based on GB/T5801.
• Mutual difference of needle roller diameter is 2μm, and the precision grade is G2 (ISO GB309).
• The diameter of inscribed circle conforms to tolerance grade F6 before the fitting of outer ring with cage and roller assembly.
• Bearing radial running clearance conforms to the value defined by 0 group of GB/T4604.
• Special precision grade is based on GB/T307.1
• For fuller information on the special requirements of bearing running clearance, inscribed circle and precision grade, please contact this company.

 

 4.Radial Needle Roller-Thrust Cylindrical Roller Bearing 

 

     Series ZARN NA is radial needle roller-double direction thrust cylindrical roller bearing . The center ring is as the outer ring of radial needle roller bearing . The inner ring’s width should match center ring and thrust roller’s , so that the axial load will be obtained during tightening nut .

    The bearing;s washer’s width is prolonged and the outer diameter takes the shape of ladder for Series ZARN…L . This bearing is suitable for less axial support or as special bearing

 Compared  with series ZARN, the center ring of series ZARF is suitable for flanged fitting and with the inlet and outlet slot .

    Compared with series  ZARN…L,  the center ring of series ZARF…L is suitable for flanged fitting and with the inlet and outlet slot .