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KOYO NSK IKO SKF Ceramic Ball Bearings 638-Z
KOYO NSK IKO SKF Ceramic Ball Bearings 638-Z

Radial Full Ceramic Ball Bearings 638-Z 1.high temperature resistance 2.corrosion resistance 3.high technology with long life

KOYO NSK IKO SKF Ceramic Ball Bearings 638-Z 

We are Jinan Kelunte Bearing Co.,Ltd,specializing in bearing line with all kinds of original bearings. We are proud to have the widest range of full ceramic ball bearings in stock, all the items included under this category are in stock.

All ceramic bearing of SiC has better performance than ZrO2 as working temperature reached to 1200°C, the corrosion resistance is much higher, and the anti-HF is much higher. It could be used in more awful working enviroment.


We have 2 types of ceramic bearing

hybrid ceramic bearing: has steel inner and outer rings with ceramic balls,  full ceramic bearing: the inner, outer rings and the balls are made of ceramic


There are many kinds of ceramic materials, the most common ceramic materials are Si3N4 that stands for the silicon nitride ceramic material and is black colored, SiC stands for the silicon carbide material and also is black colored. and the ZrO2 that stands for the zirconium dioxide, also known as zirconia or zirconium oxide, they are white colored, a ZrO2 ball looks exactly like a pearl. the ceramic material is not stronger than steel, but ceramic bearing are lighter and have lower friction than steel, that makes ceramic bearing go faster with lower heat generated.  


Ceramic bearings Advantages:

electrical and magnetism resistancewear and corrosion resistancelubrication and maintenance freelow-friction


Subjected to heat, friction, high speed, water and magnetic fields, ceramic bearings may yield significant performance advantages.  As follows:

Aircraft accessory, valve,transmission and gearbox.  Gas turbine mainshaft. Gimbals.  Semiconductor and food processing.  Dental handpiece turbines.  Sensitive instruments. 


Bearing packing divided into inner packing and outer packing. 

According to rust phase inner packing to be divided inter three classes: 

(1)short of rust phase inner packing:rust phase 3-6 months,apply to in the short term and put into use bearing. 

(2)general antirust packing period:rust phase one year,apply to general purpose bearing. 

(3)long term of rust phase inner packing:rust phase two years,apply to special and precision bearing

Trade Term: 

Payment: A:30% deposit By T/T, Western Union, Paypal, 70% before delivery. B:100% L/C at sight  

Production Lead time: 7~25days; If we have this item of your qty in stock , 2days delivery. 

Shipping methods: You can choose EMS/DHL/UPS/Fedex/TNT/standard airfreight or ocean freight via international forwarder according to gross weight & Volume. In order not to increase the risk of losing goods and shipping time, We don’t suggest <China post air mail/China post parcel/HK post air mail/HK post air parcel>although it would be much cheaper than other shipping ways. 

FOB Shipping port: Shanghai or Qingdao, mainland China. 

If you want to deal with EXW/CIF/CNF term instead of FOB, please specify. Otherwise, FOB price will be quoted under inquiry

As the advantages of Si3N4’s properties have become more fully appreciated, ceramic bearings have begun to strengthen their place in these and other applications.


KOYO NSK IKO SKF Ceramic Ball Bearings 638-Z

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