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Socket Weld

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Socket Weld Flanges are often used on smaller sizes of high pressure pipe and are attached to that pipe by inserting the pipe into the socket end and applying fillet weld around the top. This results in a smooth bore with excellent flow characteristics. Two different Socket Weld Flanges in black and green
  • Stocked in sizes from 1/2" to 6".
  • Carbon Steel Socket Weld Flanges conform to ASTM A105.
  • Stainless 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
Four different Socket Weld 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.


Bore refers to the pipe thickness on which this flange is to be used, typically values are STD (standard), S/10 (Schedule 10) and XH (extra heavy). These thickness vary with the diameter of the pipe according to published standards.


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.