Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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RA30 Finish on 304L SS
I am trying to find out what a RA30 finish is on 304L stainless steel. Does this equate to some RMS measurement or number brush finish?
engineering and manufacturing - Souderton, Pennsylvania, USA
Hi Lisa!
The best answer is "not exactly". Ra, or Roughness Average, is measured in a different way than is the Root Mean Square average. You want to surf on over to www.predev.com/smg/parameters.htm and read the explanation of the different surface finish parameters.
Have fun!
Lee Gearhart
metallurgist - E. Aurora, New York
RA is roughness average. It differs from RMS ( route means square ) in that the former measures the mean average to the peaks of the surface profile; whereas, the RMS is the measurement of both the peaks and valleys. To get an RA, double the RMs, or in this case divide by 2.
AF Kenton
retired business owner - Hatboro, Pennsylvania
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