link: http://www.ebearing.com/news2009/101901.htm
NSK is launching a new line of high speed hybrid steel-ceramic bearings as its Robust brand. Robust bearings are distinct from other hybrid bearings because they NSK’s own brand of steel SHX which has fewer inclusions and a higher hardness than standard 52100 steel. The bearings were designed with high speed machining in mind so the bearings will be able to operate at high speeds while generating less heat.
Four lines of Robust bearings are being produced:
- H (ball bearing): high speed motorized machine tool spindles
- X (ball bearing): high speeds and minimal lubrication
- XE (ball bearing): high speed and can be lubricated using mist injection
- RXH (cylindrical bearing): to be fitted to both ends of next-generation high-speed motorized spindle shafts
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