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 Ret ring with concentric serrations made ofvarious types of metal.Used when bolting force is not sufficient to seal a flat gasket,because it contacts flange face only at serration peaks.Commonly used on valve bannets and flanges attached to equipment 3 types of cross section as per right table are available.

Type & Cross Section

Depth of Serration(t)
Width 4.5mm 3.0mm Cross Section
less than 10mm inner diameter less than 200mm;0.75mm 0.5mm
10mm and above 1.0mm