Large Size Spiral Wound Gasket Dimensions Rating 300# Series A

Dimensions of Large Size Spiral Wound Gaskets of Rating 300# used with Large Size Raised Face flanges ASME B16.47 Series A


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

Class 300 NPS 26″ – 60″
NPSInner Ring Sealing ElementOuter Ring
Inside (d1) Inside (d2)Outside (d3)Outside (d4)
Dia.Dia.mmDia.mmDia.mm
26654.1685.8736.6835.2
28704.9736.6787.4898.7
30755.7793.8844.6952.5
32806.5850.9901.71006.6
34857.3901.7952.51057.4
36908.1955.81006.61117.6
38952.5977.91016.01054.1
401003.31022.41070.11114.6
421054.11073.21120.91165.4
441104.91130.31181.11219.2
461152.71178.11228.91273.3
481209.81235.21286.01324.1
501244.61295.41346.21378.0
521320.81346.21397.01428.8
541352.61403.41454.21492.3
561403.41454.21505.01543.1
581447.81511.31562.11593.9
601524.01562.11612.91644.7

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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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