Large Size Spiral Wound Gasket Dimensions Rating 150# Series A

Dimensions of Large Size Spiral Wound Gaskets of Rating 150# used with Large Size Raised Face flanges ASME B16.47 Series A


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

Class 150 NPS 26″ – 60″
NPSInner Ring Sealing ElementOuter Ring
Inside (d1) Inside (d2)Outside (d3)Outside (d4)
Dia.Dia.mmDia.mmDia.mm
26654.1673.1704.9774.7
28704.9723.9755.7831.9
30755.7774.7806.5882.7
32806.5825.5860.6939.8
34857.3876.3911.4990.6
36908.1927.1968.51047.8
38958.9977.91019.31111.3
401009.71028.71070.11162.1
421060.51079.51124.01219.2
441111.31130.31178.11276.4
461162.11181.11228.91327.2
481212.91231.91279.71384.3
501263.71282.71333.51435.1
521314.51333.51384.31492.3
541358.91384.31435.11549.4
561409.71435.11485.91606.6
581460.51485.91536.71663.7
601511.31536.71587.51714.5

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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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