Slip On Flanges are manufactured with an inside diameter that is slightly larger than the pipe's outside diameter and are connected to the pipe via fillet weld at the top and bottom of the flange. Two different Slip On Flanges
  • Stocked in sizes from 1/2" to 24", depending on the material.
  • Aluminum Flanges conform to ASM 6061 T6.
  • Carbon Steel Slip On Flanges conform to ASTM A105.
  • Stainless Steel Slip On Flanges conform to ASTM A182. Both 304L and 316L available.
  • Available with both a Raised Face and a Flat Face.
click here for bolting specifications Temperature/Pressure cross reference by Class
Four different Slip On Flanges.
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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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