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Tolerance band for finish: Rz=10um AND Rzmax=20um

November 18, 2009

There are two requirements under the surface finish symbol
Rz=10um
Rzmax=20um

Are these upper and lower limits of the finish allowed?

John Zinnecker
Quality manager - Mason, Ohio

If these 2 numbers appear side by side or next to each other, I would say you are correct to assume they are a min max notation; however check title block to see if there is a tolerance indicated there. If tolerance is there, then it is not min, Max. Last and simplest way is to ask the originator of dwg. or company requesting info.

AF Kenton
retired business owner - Hatboro, Pennsylvania
December 11, 2009

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