there are many types of bearings .... 1)ball bearing 2)roller bearing 3)ball thrust bearing 4)roller thrust bearing & 5)tapered roller thrust..
anti-friction bearing
NAICS 332991 applies to Ball and Roller Bearing Manufacturing.
roller thrust bearing
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1 rollers 2 bearing race
Roller bearing
Because in most cases they are a tapered roller bearing.
It is not known who specifically invented the roller ball bearing. There are examples of their use by the ancient Egyptians. However, it is thought that they may have been invented before the wheel.
CZH bearings? did you mean Changzhou Zhihua Bearings Co., Ltd.? Changzhou Zhihua Bearings Co., Ltd. is a professional needle roller bering manufacturer. they specialized in needle roller bearing for many years. if you are looking for a best needle roller bearing supplier, the company will be your best choice.
In 2001 U.S. establishments involved in ball and roller bearing manufacturing employed a total of more than 32,200.