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Sealing Surface Roughness Query


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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