What Is a Flange Spigot and How Does It Function?
A flange spigot is a vital component in piping systems. It joins a flange and a spigot to build a sturdy, leak-free connection between pipes or fittings. A flanged spigot is a fitting for piping systems. One end carries a flange that bolts to another piece, like a pipe or valve flange. The other end, called the spigot, fits snugly into another pipe or socket.
How Does a Flange Spigot Work in Pipe Connections?
Flange spigots deliver strength and sealing at pipe joints. The flange provides a wide area for sealing and fastening. Bolts and a gasket usually stop leaks. The spigot end slips into another pipe or fitting’s socket. This keeps the pipeline straight and flowing well.
Differences Between Flanged and Spigot-End Fittings
Flanged and spigot-end fittings both link pipes, but they differ. Flanged fittings use bolted joints for connections that can come apart. Spigot-end fittings slide into sockets. They may need welding or sealing rings. Flanged connections are easier to undo for maintenance or replacement.
Where Are Flange Spigots Commonly Used?
Oil and Gas Pipelines
In oil and gas systems, high-pressure control is critical. Flange spigots offer tough connections. They handle stress and reduce leak chances.
Water Treatment Facilities
Water treatment plants trust flange spigots. They match well with ductile iron pipes and fight rust. They join various pipes, like ductile iron, PVC, steel, or concrete. This makes them useful and cost-effective.
Chemical Processing Plants
Flange spigots made from materials like stainless steel or coated ductile iron suit chemical settings. Corrosion resistance is essential here.

What Materials Are Used to Manufacture Flange Spigots?
Common Materials Based on Application Needs
Materials include ductile iron grade 500-7/450-12 per ISO 1083 for the fitting body and retainer, EPDM/NBR for rings, and zinc-coated or dacro steel for stubs. These give strong mechanical strength and corrosion resistance.
Stainless Steel, Ductile Iron, PVC, and HDPE
· Stainless Steel: Ideal for corrosive places like chemical plants.
· Ductile Iron: Common in city water systems for its durability.
· PVC & HDPE: Perfect for lightweight uses needing bendability.
Flange spigots can be made from materials like PVC, ductile iron, stainless steel, and others, based on the application and medium carried.
How Are Flange Spigots Installed and Maintained?
Installation: Precisely align flanges before bolting with torque-controlled tools to prevent joint stress and early failure.
Maintenance: Regularly inspect joints for rust or gasket wear.
What Standards Govern the Use of Flange Spigots?
Global standards ensure safety across uses:
Ductile Iron Flange Fittings Standards: ISO2531, ISO4179, ISO8179, BS EN 545, BS EN598, BS4772, ISO7005-2, EN1092-2:1997.
These cover material composition (ISO 1083), pressure ratings (PN10–PN40), dimensional accuracy (ISO2531), internal/external coatings (ISO4179 & ISO8179), and testing protocols (EN545). Each unit gets a 100% water pressure test per ISO 2531 / EN 545 / EN598 to confirm integrity before use.
Order Your Flange Spigot from FLUIDO Today for Quality and Reliability!
FLUIDO has delivered high-quality piping fittings worldwide since 1994. As a leading manufacturer and exporter of steel valves, fittings, and flanges, FLUIDO serves over 35 countries with more than 20 years of experience. The inventory includes flange spigots made under strict quality control, certified by ISO9001.
With sizes from DN50-DN2000 available under PN10–PN40 pressure ratings, FLUIDO meets diverse industrial needs, including municipal waterworks, water treatment plants, irrigation networks, and pumping stations.
For superior performance backed by decades of expertise—contact FLUIDO today via email at info@fluidovalve.com.