From what I have looked at hardness of rollers or bushes need to be HRC 58 to 64
Wether silver steel or stainless can be hardened to this I do not know.
But seeing that usage is not 24 hrs 7 days a week and is more occasional and it is only a small rotational low speed usage then likely with constant greasing will be plenty good enough.
Of course and can be checked in 12months
http://www.google.co.uk/url?sa=t&rct=j& ... 4634,d.cWc
Page A16.
Hope that is of help.
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GPZ Unitrak 1100
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