Tube outside diameter
-
DN15 / 21.30 mm
(5)
-
DN20 / 26.90 mm
(5)
-
DN25 / 33.70 mm
(5)
-
DN32 / 42.40 mm
(5)
-
DN40 / 48.30 mm
(5)
-
DN50 / 60.30 mm
(5)
-
DN65 / 76.10 mm
(6)
-
DN80 / 88.90 mm
(5)
-
DN100 / 108.00 mm
(1)
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DN100 / 114.30 mm
(5)
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DN125 / 139.70 mm
(5)
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DN150 / 159.00 mm
(2)
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DN150 / 168.30 mm
(5)
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DN200 / 219.10 mm
(3)
-
DN250 / 273.00 mm
(3)
-
DN300 / 323.90 mm
(3)
Steel grade
Availability
Stainless steel forged flat flange DN100 108 mm EN1092-1/01B (PN10/16) 1.4301 / 1.4307 / 304 / 304L
- Tube outside diameter (OD): 108 mm
- Number of holes: 8
- Weight: 4.39 kg
- Norm: EN1092-1/01B
- Nominal pressure: PN10/16
- Steel grade: 1.4301 / 1.4307 / 304 / 304L
Availability:
sold out
Stainless steel forged flat flange DN100 114,3 mm EN1092-1/01B (PN10/16) 1.4541 / 321
- Tube outside diameter (OD): 114.3 mm
- Number of holes: 8
- Weight: 4.39 kg
- Norm: EN1092-1/01B
- Nominal pressure: PN10/16
- Steel grade: 1.4541 / 321
Availability:
available
Dispatched within: 3 days
Stainless steel forged flat flange DN100 114,3 mm EN1092-1/01B (PN10/16) 1.4571 / 316Ti
- Tube outside diameter (OD): 114.3 mm
- Number of holes: 8
- Weight: 4.39 kg
- Norm: EN1092-1/01B
- Nominal pressure: PN10/16
- Steel grade: 1.4571 / 316Ti
Availability:
available
Dispatched within: 3 days
Stainless steel forged flat flange DN125 139,7 mm EN1092-1/01B (PN10/16) 1.4301 / 1.4307 / 304 / 304L
- Tube outside diameter (OD): 139.7 mm
- Number of holes: 8
- Weight: 5.41 kg
- Norm: EN1092-1/01B
- Nominal pressure: PN10/16
- Steel grade: 1.4301 / 1.4307 / 304 / 304L
Availability:
available
Dispatched within: 3 days
Stainless steel forged flat flange DN125 139,7 mm EN1092-1/01B (PN10/16) 1.4401 / 316 / 1.4404 / 316L
- Tube outside diameter (OD): 139.7 mm
- Number of holes: 8
- Weight: 5.41 kg
- Norm: EN1092-1/01B
- Nominal pressure: PN10/16
- Steel grade: 1.4401 / 316 / 1.4404 / 316L
Availability:
available
Dispatched within: 3 days
Stainless steel forged flat flange DN125 139,7 mm EN1092-1/01B (PN10/16) 1.4541 / 321
- Tube outside diameter (OD): 139.7 mm
- Number of holes: 8
- Weight: 5.41 kg
- Norm: EN1092-1/01B
- Nominal pressure: PN10/16
- Steel grade: 1.4541 / 321
Availability:
available
Dispatched within: 3 days
Stainless steel forged flat flange DN125 139,7 mm EN1092-1/01B (PN10/16) 1.4571 / 316Ti
- Tube outside diameter (OD): 139.7 mm
- Number of holes: 8
- Weight: 5.41 kg
- Norm: EN1092-1/01B
- Nominal pressure: PN10/16
- Steel grade: 1.4571 / 316Ti
Availability:
available
Dispatched within: 3 days
Stainless steel forged flat flange DN15 21,3 mm EN1092-1/01B (PN10/16/25/40) 1.4401 / 316 / 1.4404 / 316L
- Tube outside diameter (OD): 21.3 mm
- Number of holes: 4
- Weight: 0.67 kg
- Norm: EN1092-1/01B
- Nominal pressure: PN10/16/25/40
- Steel grade: 1.4401 / 316 / 1.4404 / 316L
Availability:
available
Dispatched within: 3 days
Stainless steel forged flat flange DN15 21,3 mm EN1092-1/01B (PN10/16/25/40) 1.4571 / 316Ti
- Tube outside diameter (OD): 21.3 mm
- Number of holes: 4
- Weight: 0.67 kg
- Norm: EN1092-1/01B
- Nominal pressure: PN10/16/25/40
- Steel grade: 1.4571 / 316Ti
Availability:
available
Dispatched within: 3 days
Stainless steel forged flat flange DN150 159 mm EN1092-1/01B (PN10/16) 1.4301 / 1.4307 / 304 / 304L
- Tube outside diameter (OD): 159 mm
- Number of holes: 8
- Weight: 7.21 kg
- Norm: EN1092-1/01B
- Nominal pressure: PN10/16
- Steel grade: 1.4301 / 1.4307 / 304 / 304L
Availability:
available
Dispatched within: 3 days
Stainless steel forged flat flange DN150 168,3 mm EN1092-1/ 01B (PN10/16) 1.4401 / 316 / 1.4404 / 316L
- Tube outside diameter (OD): 168.3 mm
- Number of holes: 8
- Weight: 7.14 kg
- Norm: EN1092-1/ 01B
- Nominal pressure: PN10/16
- Steel grade: 1.4401 / 316 / 1.4404 / 316L
Availability:
available
Dispatched within: 3 days
Stainless steel forged flat flange DN150 168,3 mm EN1092-1/01B (PN10/16) 1.4301 / 1.4307 / 304 / 304L
- Tube outside diameter (OD): 168.3 mm
- Number of holes: 8
- Weight: 7.14 kg
- Norm: EN1092-1/01B
- Nominal pressure: PN10/16
- Steel grade: 1.4301 / 1.4307 / 304 / 304L
Availability:
sold out
Plate flanges — what they are and how they’re used
Plate flanges, often called flat flanges, are flat metal discs or rings welded or bolted to a pipe end, equipment nozzle or a flat plate to create a secure connection point. In practice they form a simple, robust way to join piping, attach valves and pumps, or provide a bolted face for gaskets. They are an essential type of pipe fittings and are widely used where a flat mating surface is required.
Typical uses and applications
Plate flanges are extremely versatile. Common applications include:
- Industrial piping systems and process plants (petrochemical, chemical).
- Food, beverage and pharmaceutical equipment where hygienic stainless surfaces are needed.
- Marine and offshore installations exposed to salt water and aggressive environments.
- HVAC, heating systems and boiler connections that demand heat-resistant materials.
- Automotive workshop repairs, small garage projects and general mechanical engineering.
- Construction and structural connections where a flat bolted face is useful.
Materials — stainless, acid‑resistant and heat‑resistant steels
Our offer is focused exclusively on steels suitable for demanding environments: stainless steel, acid‑resistant and heat‑resistant grades. We do not sell aluminium or plain carbon steel.
Common material grades and their familiar identifiers (European EN and common US/UNS marks) include:
- 304 / 1.4301 (UNS S30400) — general-purpose stainless steel with good corrosion resistance for many indoor applications.
- 316 / 1.4401 (UNS S31600) and 316L / 1.4404 (UNS S31603) — widely used as an acid‑resistant and marine-grade option with improved resistance to chlorides and many chemicals.
- Duplex 2205 / 1.4462 (UNS S32205) — higher strength and improved resistance to stress corrosion cracking and chloride environments.
- 321 / 1.4541 (UNS S32100) and 310 / 1.4841 (UNS S31000) — examples of heat‑resistant stainless steels used where elevated temperatures are present.
- Ferritic grades (e.g. 430 / 1.4016, UNS S43000) — magnetic stainless steels used where moderate corrosion resistance and good formability are required.
Choosing the right grade depends on temperature, chemical exposure, mechanical loads and whether the application is offshore, sanitary or general industrial.
Standards, compatibility and sealing
Plate flanges are manufactured to recognised standards and drilling patterns so they match common pipe fittings and gaskets. Typical standards to check when selecting a flange include European standards such as EN 1092‑1 (PN ratings) and American standards like ASME B16.5 (ANSI flanges). Ensure the flange face type (raised face, flat face, ring type joint) and bolt pattern match the mating component and the chosen gasket.
How to choose plate flanges — practical checklist
When selecting a plate flange for a project, consider:
- Material grade: choose based on corrosion risk, temperature and strength requirements (e.g. 316/316L for marine/acid resistance, 310 or 321 for heat resistance).
- Standard and drilling: confirm PN or ANSI class and bolt hole pattern to match connected equipment.
- Face finish: flat face vs raised face — choose according to gasket type and application.
- Thickness and dimensions: ensure the plate and bolt length are suitable for mechanical loads.
- Surface treatment: polished or as‑machined finishes for hygienic or aesthetic requirements.
Who buys plate flanges
Customers range from DIY and workshop users needing reliable pipe fittings for repairs, through contractors and fabricators in building services, to engineers in heavy industry, offshore, chemical and food processing sectors looking for certified industrial flanges.
Why buy stainless plate flanges from a specialist supplier
Specialist stainless suppliers can advise on grade selection, ensure conformity to EN/ASME standards and provide traceability — important for regulated sectors such as food, pharmaceutical and offshore. Buying plate flanges in the correct stainless, acid‑resistant or heat‑resistant grade extends service life and reduces maintenance and downtime.
Need help choosing?
If you’re unsure which plate flanges or material grade suits your application — whether you need flat flanges for a pump base, an industrial flange for a pressure line, or corrosion‑resistant flanges for marine use — contact our team with details of the medium, temperature, pressure class (PN or ANSI) and bolt pattern. We’ll recommend suitable stainless, acid‑resistant or heat‑resistant options.