Letter 25064

Surface finish [India] 

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Generally we indicate the surface finish in Ra & Rz values. But one of our customer has indicated the surface finish value as 6.3 S which should be obtained by grinding method. We would like to know what the ways of indicating the surface finish . What is the conversion of 6.3 S in terms of Ra & Rz. We would also like know when the difference between these three.

K.S.SreeKumar
Adhesives & Sealents supplier - Chennai, Tamilnadu, India

Never heard of a standard "S". I suggest you go back to your customer and advise him to specify a common standard of Ra, RMS, or Rz.

AF Kenton Nova Finishing Systems Inc. Huntingdon Valley, PA

6.3S refers to the maximum height of a profile. I dont think it is a SF symbol.

Nawaz Maditheti
- Minnesota, MN

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