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Blind Flanges are round plates which have all relevant boltholes but lack a center hole and thus are used to close off the ends of a piping system or a pressure vessel opening. Two different blind flanges with a flat face and a raised face.
  • Forged Steel Blind Flanges conform to ASTM A105 while Stainless Steel Flanges conform to ASTM A182.
  • Stocked in sizes from 1/2" to 24".
  • Available both with a flat face and a raised face.
  • Flanges of Class 150#, 300#, 600#, 900#, and 1500# are stocked.
  • Available in Carbon Steel as well as Stainless in grades 304L and 316L (L=low carbon).
  • Carbon Steel Flanges are available in both domestic and less expensive Imported versions. All Stainless Blind Flanges that we stock are imported.
click here for bolting specifications Temperature/Pressure cross reference by Class
Three different Blind Flanges with a flat face and a raised face.
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Domestic = Made in the USA

Import = Made anywhere else

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Originally the numbers for "Class" (150, 300, 600, etc.) was the pressure (psig) at the corresponding saturated steam temperature. Ratings today are different because of changes made in materials and flange design.  Link to chart of temperature/pressure by class is above.

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Flanges are avaiable in aluminum, carbon steel and stainless steel in grades 304, 304L, 316 and 316L. The L designates "low carbon", making the fitting good for welding.

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Flat Face Flanges have a gasket surface in the same plane as the face of the bolting circle.  For Raised Face Flanges, the gasket surface is raised slightly above the face of the bolting circle, concentrating more pressure on a smaller gasket area.


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