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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 -
Class 400 NPS 1/2-24
NPS Inner Ring Sealing Element Outer Ring
d1 d2 d3 d4
1/2 14.2 19.1 31.8 54.1
3/4 20.6 25.4 39.6 66.8
1 26.9 31.8 47.8 73.2
1.1/4 38.1 47.8 60.5 82.6
1.1/2 44.5 54.1 69.9 95.3
2 55.6 69.9 85.9 111.3
2.1/2 66.5 82.6 98.6 130.3
3 81 101.6 120.7 149.4
4 102.6 120.7 149.4 177.8
5 128.3 147.6 177.8 212.9
6 154.9 174.8 209.6 247.7
8 205.7 225.6 263.7 304.8
10 255.3 274.6 317.5 358.9
12 307.3 327.2 374.7 419.1
14 342.9 362 406.4 482.6
16 389.9 412.8 463.6 536.7
18 438.2 469.9 527.1 593.9
20 489 520.7 577.9 647.7
24 590.6 628.7 685.8 768.4
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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