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  1. Hi All, I have a question on sealing surface roughness specification as below. A connector with FIP gasket specifies the sealing surface as '4.7/ Ra Max 0.4'. I believe 'Ra max 0.4' is 0.4μm surface roughness spec but what it the 4.7? I've taken a look in EN-ISO 1302:2002 but it doesn't appear to clarify this. Help appreciated.
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