Good sale KOYO needle bearing NA4920

Good sale KOYO needle bearing NA4920

Specifications:

1.Wide range of use
2.Delivery in time
3.Free sample
4.Competitive price 

Needle roller bearings

1.Types:HKseries,KRseries,NAseries,NATRseries,NUTRseries,RNA,ZARN,ZKLF,ZKLNseries,etc.
2. Material: Gcr15-China,(AISI)52100-USA,(DIN)100CR6-Germany
3. Retainer: J,
4. Clearance: CN, C2, C3, C4, C5
5. Precision level: ABEC-1, ABEC-3, ABEC-5
6. Main application: Needle roller bearings are widely used in machine tools, metallurgical machinery, textile machinery and printing machinery and other machinery and equipment, and mechanical system design allows a very compact and nimble.
7. Quick delivery
Needle bearings are roller bearings with rollers that have high length-to diameter ratios. Needle bearings are used in farm and construction equipment, automotive transmissions, small gasoline engines, gear pumps, small appliance and tool motors, alternators, and aircraft controls.
Needle bearings are usually lubricated with grease, but oil or oil-mist lubrication is preferred for heavy-duty or high-speed applications. Many light-duty needle bearings never require relubrication, but high loads or speeds demand it.

Pictures of needle bearing:

Other products we can provide:

a) How to prolong service life of bearings?
Accurate installation and using,alignment,timely monitor,re lubrication etc.

b) Reason for bearings failure?
Usually is incorrect using method,pollution,improper use of lubricant,damage happened in installation and handing,also including installation error.according to the traces can know the reason why is failure.

c) How to choose bearings?
Analyse mechanical device and use conditions.clear the requiremment of bearings.select type of bearings,select distribution way of bearings.selet dimensions of bearings,select installation method of bearings.

d) When select bearings specifications,what you need to consider?
The precision of the bearings(rotating precision,dimensional tolerances)internal clearance and preload bearing material and heat treatment.structure of cage and material.

e) Payment method,packing way,transport method,time of delivery?
T/T,PAYPAL,WESTERN UNION,L/C
Tube,box,carton,pallet,
By sea,by air
2-5days after receipt of payment.