Spindle bearings for Compact 5 CNC


My bearings are bad and needs replacing.
The parts catalogue says it's standard 6006 2Z. 

But for precision parts, should'nt one get better tolerance than standard? The machine has held very nice tolerances in the patch. Less than 0.001 mm. 

Also the serpentine washer is called 6006/2K in the parts catalogue, but that seems to be an old standard, does anyone know what it's called now. So far i've googled in vain.


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