FAG and NSK are the world's most influential bearing manufacturers.
Ranked in the world are: the merger of the German FAG & INA, Sweden SKF, American TIMKEN, Japan NSK, Japan, NTN, Japan NMB.
Emphasis on INA needle roller bearings, linear motion, spherical
Emphasis on TIMKEN Tapered roller, special steel
NMB emphasis on miniature Slewing bearing (I have not heard of more than 10mm diameter NMB bearings)
SKF, FAG, NSK can produce all currently known bearing
Backing bearings are particularly thick outer ring of the rolling bearing, when used to form a group to be mounted on the shaft of a stationary support rollers. Pressure on the work roll through the intermediate roller and the support roller is passed to the system to the rack through the saddle. Generally used for multi-roll cold rolling mill equipment can also be used for other occasions, such as straightening machine.
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