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Dimensions of Spiral Wound Gaskets ASME B16.20 used with Raised Face flanges ASME B16.5

Cross-section Spiral Wound gasket

Other Pressure Classes

150 -
300 -
400 -
600 -
900 -
2500
Class 2500 NPS 1/2-12
NPS Inner Ring Sealing Element Outer Ring
d1 d2 d3 d4
1/2 14.2 19.1 31.8 69.9
3/4 20.6 25.4 39.6 76.2
1 26.9 31.8 47.8 85.9
1.1/4 33.3 39.6 60.5 104.9
1.1/2 41.4 47.8 69.9 117.6
2 52.3 58.7 85.9 146
2.1/2 63.5 69.9 98.6 168.4
3 78.7 92.2 120.7 196.9
4 97.8 117.6 149.4 235
5 124.5 143 177.8 279.4
6 147.3 171.5 209.6 317.5
8 196.9 215.9 257.3 387.4
10 246.1 270 311.2 476.3
12 292.1 317.5 368.3 549.4
NPS d1 d2 d3 d4
Inner Ring Sealing Element Outer Ring

General notes:

Marking of Spiral Wound Gaskets

Marking of Spiral Wound Gaskets
PP
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