Spiral Wound Gasket Dimensions Rating 400#

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Dimensions of Spiral Wound Gaskets of Rating 400# as per ASME B16.20 used with Raised Face flanges ASME B16.5


150# | 300# | 400# | 600# | 900# | 1500# | 2500#

Class 400 NPS 1/2" - 24"
NPSInner Ring Sealing ElementOuter Ring
Inside (d1) Inside (d2)Outside (d3)Outside (d4)
Dia.Dia.mmDia.mmDia.mm
1/214.219.131.854.1
3/420.625.439.666.8
126.931.847.873.2
1-1/438.147.860.582.6
1-1/244.554.169.995.3
255.669.985.9111.3
2-1/266.582.698.6130.3
381.0101.6120.7149.4
4102.6120.7149.4177.8
5128.3147.6177.8212.9
6154.9174.8209.6247.7
8205.7225.6263.7304.8
10255.3274.6317.5358.9
12307.3327.2374.7419.1
14342.9362.0406.4482.6
16389.9412.8463.6536.7
18438.2469.9527.1593.9
20489.0520.7577.9647.7
24590.6628.7685.8768.4

General notes:

  1. Dimensions are in millimeters unless otherwise indicated.
  2. Image shows a Spiral Wound gasket with Inner – and Outer ring.
  3. d1 = Inside diameter when Inner ring is used.
  4. d2 = Inside diameter sealing element when no Inner ring is used.
  5. d3 = Outside diameter of sealing element.
  6. d4 = Outside diameter of Outer ring.
  7. Thickness of inner and outer ring: 2.97 mm – 3.33 mm.
  8. Thickness sealing element: 4.45 mm.
  9. Tolerance Outside diameter for NPS 1/2 through NPS 8 is ± 0.8 mm; for NPS 10 trough NPS 24 tolerance is + 1.5 mm – 0.8 mm.
  10. ASME B16.20 does not covers class 400 flanges up to NPS 3 and class 900 flanges up to NPS 2½.
  11. There are no class 400 flanges NPS 1/2 thru NPS 3 (use Class 600), class 900 flanges NPS 1/2 thru NPS 2½ (use Class 1500), or class 2500 flanges NPS 14 or larger.
  12. The inner ring inside diameters shown for NPS 1¼ thru 2½ in class 1500 and 2500 will produce inner ring widths of 0.12 inches, a practical minimum for production purposes.
  13. ASME B16.20 which covers spiral wound gaskets requires the use of solid metal inner rings in: Pressure Class 900, nominal pipe sizes 24 and larger, Pressure Class 1500 from nominal pipe sizes 12 and larger, Pressure Class 2500 from nominal pipe sizes 4 and larger and all PTFE filled gaskets.

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