Flanges Beyond API 6A Specs
Complete range of industrial-grade flanges engineered for every pressure class, temperature range, and application requirement
All Flange Types (19)
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Weld Neck Flange
Tapered hub design reduces stress concentration in the weld. Most common flange type for high-pressure applications and thermal cycling conditions. Superior strength compared to slip-on flanges.
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Slip-On Flange
Pipe slides over flange hub then welded on both sides. Lower cost than weld neck flanges. Suitable for low-pressure and non-critical applications. Easier installation but slightly weaker design.
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Threaded Flange
Internal threads engage with pipe threads. No welding required, simplifying installation. Limited to low and medium pressure applications. Common in small-diameter piping systems.
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Socket Weld Flange
Pipe socket into flange hub and fillet welded. Compact design ideal for small-diameter, high-pressure piping. Single fillet weld at the pipe OD. Superior to threaded for higher pressures.
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Blind Flange
Solid disc flange with no bore hole. Used to close pipe ends and create removable caps. Common in isolation, testing, and future expansion connections.
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Lap Joint Flange
Pipe overlaps flange hub and is welded on one side only. Uses a backing ring inside the pipe. Cost-effective for frequent disconnection requirements. Lower strength than weld neck.
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Reducing Flange
Flange with bore size smaller than nominal flange size. Used to connect different pipe sizes while providing bolted connection. Combines reduction with flange coupling.
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Orifice Flange
Flanges with tapped holes for differential pressure measurement instrumentation. Used in flow measurement systems with orifice plates. Includes unique pressure sensing configurations.
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Spectacle Blind
Two discs connected by a bridge forming a figure-8 shape. One disc opens (bore hole) one side, other disc blinds (solid) the other side. Allows quick switching between open and closed states.
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Swivel Flange
Flange with rotational hub allowing angular adjustment without bolting. Reduces installation stress on rigid piping. Used where alignment flexibility is needed during assembly.
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Ring Joint Flange
Octagonal or oval metal ring seals between flange faces instead of flat gasket. Provides superior sealing for high pressure and high temperature applications. Requires precision groove machining.
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Tongue & Groove Flange
Flange face with tongue projecting into mating groove. Provides gasket locating and improves sealing. Common in low-pressure applications. Reduces gasket extrusion risk.
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Male & Female Flange
Male flange has raised face, female has recessed face. Provides improved gasket support and sealing. Common in pressure equipment applications. Prevents gasket blowout.
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Lapped Flange
Flange with overlapping connection to pipe. Minimizes threading requirements. Combines features of slip-on with improved strength. Useful where threading is impractical.
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Weldolet
Forged outlet fitting that welds to main pipe. Provides branch connection without cutting main pipe. Available in various types (eldobelt, latrolet, etc.). Used for branch takeoffs.
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Companion Flange
Matching flange bolted to threaded or socketweld hub flanges. Used with equipment nozzles and specialty connections. Provides a standard connection interface.
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Expander Flange
Flange hub expands from smaller to larger pipe diameter. Used for transition connections where step increase is required. More economical than two flanges and a transition piece.
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AWWA C207 Flange
Water utility standard flange per AWWA C207. Used extensively in municipal water systems. Large sizes available. Specified for water distribution systems.
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DIN EN 1092-1 Flange
European standard flange for industrial applications. Different face forms and pressure classes. Used globally in process and utility systems. Metric sizing standard.
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