Class 150 | 300 | 400 | 600 | 900

General notes:

• Dimensions are in millimeters unless otherwise indicated.
• Image shows a Spiral Wound gasket with Inner - and Outer ring.
• d1 = Inside diameter when Inner ring is used.
• d2 = Inside diameter sealing element when no Inner ring is used.
• d3 = Outside diameter of sealing element.
• d4 = Outside diameter of Outer ring.
• The gasket thickness tolerance is ± 0.13 mm measured across the metallic portion of the gasket, not including the filler, which may protrude slightly beyond the metal.
• The gasket inside diameter tolerance for NPS 26 through NPS 34 is ± 0.8 mm, and the tolerance for NPS 36 through NPS 60 is ± 1.3 mm.
• The gasket outside diameter tolerance for NPS 26 through NPS 60 is ± 1.5 mm.
• The centering ring outside diameter tolerance is ± 0.8 mm.
• The inside diameter tolerance is ± 3.0 mm.
• Thickness of inner and outer ring: 2.97 mm - 3.33 mm.
• ASME B16.47 Series A flanges NPS 12 through NPS 24 have the same raised face dimensions as ASME B16.5 flanges.
• There are no Class 900 flanges NPS 50 and larger.

Marking of Spiral Wound Gaskets