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N3 finish

I have a blueprint that calls out N3 (the N3 is above a checkmark, I think indicating it is an RMS finish). I don't know what this is. Can someone answer this question?

Jan Clark
- Carlsbad, California, USA
2002

N3 correspomds to 4 micro-inches (definition found at www.predev.com/smg/specification.htm).

Giovanni M. Ciriani
Promotion - Altavilla VI, Italy
2002

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