I am having difficulty specifying a proper surface finish for the gland surfaces of a static vacuum o-ring face seal. The drawing currently specifies a 16 microinches Roughness Average. The vendor has supplied parts with a few large pits of depth greater than 4 times the specified avg of 16 and claims the average roughness of the entire surface is still below 16. These large pits may increase the vacuum leak rate. Is there a more detailed method of specifying surface finish that would minimize these anomalies?
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