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Threaded Flanges have a bore with tapered threads and connect to pipes that have external threads. The primary benefit of Threaded Flanges is that no welding is required to attach them. Five different Threaded Flanges
  • Stocked in sizes from 1/2" to 8".
  • Carbon Steel Threaded Flanges conform to ASTM A105.
  • Stainless Steel Threaded Flanges conform to ASTM A182. Both 304L and 316L available.
  • Classes available range from 150# to 1500#.
click here for bolting specifications Temperature/Pressure cross reference by Class
Three different Threaded Flanges.

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Domestic = Made in the USA

Import = Made anywhere else


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.


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.


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.