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Lap Joint

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Lap Joint Flanges slide directly over a pipe and are used with Stub Ends. Typically, a pipe is welded to the Stub End leaving the Lap Joint Flange to rotate freely around the stub end, simplifying bolt hole alignment. Two lap joint flanges
  • Lap Joint Flanges are forged steel and conform to ASTM A105.
  • Stocked in sizes from 1.50" to 20".
  • Forged Steel Lap Joint Flanges are available in both domestic and less expensive Imported versions.
  • Stub Ends are sold separately.
click here for bolting specifications Temperature/Pressure cross reference by Class
Two different lap joint flanges that slide directly over a pipe.

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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.