Surface roughness spec: B2 and A3

May 09, 2006 1 Replies
A

Hi all,



I read a spec by an extruder that they were capable of a "B2 finish from the die, and with tumbling we can achieve an A3". I have never heard these specs before for finish and can't seem to find anything online. How does this relate to roughhness in Ra (microinches)?



Thanks a million!



Adam S



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N

Nor me, but it sounds a bit like the Sa classifications for grit blasting (originally Swedish, I think, though widely recognised)

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