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Protective N 8 finish

Kindly let me know what is Protective N 8 finish in aluminum jobs ?

Sharnpal Singh Taggar
central tool room a-5 , focal point , ludhiana - India
2006

2006

Perhaps a Roughness Grade Number?
N8 is an Ra of 3.2 microns -- see letter 7560.

Ken Vlach [deceased]
- Goleta, California

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