Large Size Spiral Wound Gasket Dimensions Rating 400# Series A

Dimensions of Large Size Spiral Wound Gaskets of Rating 400# used with Large Size Raised Face flanges ASME B16.47 Series A


150# | 300# | 400# | 600# | 900#

Class 400 NPS 26″ – 60″
NPSInner Ring Sealing ElementOuter Ring
Inside (d1) Inside (d2)Outside (d3)Outside (d4)
Dia.Dia.mmDia.mmDia.mm
26660.4685.8736.6891.9
28711.2736.6787.4892.3
30755.7793.8844.6946.2
32812.8850.9901.71003.3
34863.6901.7952.51054.1
36917.7955.81006.61117.6
38952.5971.61022.41073.2
401000.31025.71076.51127.3
421051.11076.51127.31178.1
441104.91130.31181.11231.9
461168.41193.81244.61289.1
481206.51244.61295.41346.2
501257.31295.41346.21403.4
521308.11346.21397.01454.2
541352.61403.41454.21517.7
561403.41454.21505.01568.5
581454.21505.01555.81619.3
601517.71568.51619.31682.8

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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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