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Stainless Steel Flanges

Preventing flange failure in corrosive or high-pressure systems depends on the right stainless material and exact machining. Our stainless steel flanges use forged grades like 304, 316, Duplex, and Super Duplex for dependable joint performance.

Standard Specification

ASTM A182 / A479 (US), EN 10088-2 (EU), JIS G4303 (Japan)

Pressure Rating

Class 150 to 2500 (PN10 to PN420) [Cryogenic derating applicable]

Material

304/304L (1.4301/1.4307), 316/316L (1.4401/1.4404), Duplex (1.4462), Super Duplex (1.4501)

Nominal Size

½” to 60″ (DN15 to DN1500) [Custom sizes up to 120″ (DN3000)]

Flange Type

WN, SO, SW, BL, TH, LJ [All ASME B16.5 types available]
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Product Description

They fit critical systems where leakage, crevice corrosion, or face misalignment would lead to costly downtime. We keep tolerances tight and finishes controlled for process reliability across chemical, water, and energy applications.

Facing Type

RF, FF, RTJ [RTJ common in offshore applications]

Dimensions

ASME B16.5 / EN 1092-1 [±0.5mm tolerance on critical dimensions]

Bolt Circle Diameter

Matches standard flanges [Hole alignment ±0.5°]

Number & Size of Bolt Holes

Stainless bolts (ASTM A193 B8/B8M) [Non-galling thread treatments]

Surface Finish

32-63 μin Ra (standard), 8-16 μin Ra (sanitary) [EP/MP options]

Corrosion Resistance

PREN 18-45 [Crevice/pitting resistance tested per ASTM G48]

Temperature Rating

-269°C to +800°C [Lower for sensitized grades]

Material Certification

EN 10204 3.1, NACE MR0175, PED 2014/68/EU [HIC tested]

Gasket Compatibility

PTFE, Graphite, Spiral Wound [No chloride-containing gaskets]

Coating/Plating

Passivation (ASTM A967), Electropolishing [No galvanizing]

Manufacturing Method

Forged (A182) + CNC machining

Technical Advantages

We forge all stainless steel flanges to ASTM A182 or equivalent for strength and weldability. Machining follows ASME B16.5 or EN 1092-1 with ±0.5 mm tolerance and verified bolt alignment to ±0.5°. 
Surface finishes meet 32-63 μin Ra for general use and 8-16 μin Ra for sanitary applications, with optional EP or MP. Each batch includes 3.1 certification, NACE MR0175 compliance, and traceability across pressure and temperature

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Industry Applications

Chemical Plants

Handles acidic and chlorinated lines using Duplex flanges tested for ASTM G48 crevice resistance.

Desalination Units

Withstands salt exposure using Super Duplex flanges with PREN above 40 and EP surface finish.

Pharmaceutical Lines

Matches sanitary piping with 8-16 μin Ra finish and electropolishing for CIP compatibility.

Oil and Gas Platforms

Uses RTJ face flanges and A182 F316 for high-pressure joints in offshore environments. 

Cryogenic Systems

Stays dimensionally stable from -269°C upwards using 304L or 316L forgings with derated pressure.

Food Processing Lines

Supports hygienic joints with non-galling threads and chloride-free gasket compatibility. 

Stainless Flanges That Match Process Demands

Downtime due to pitting, leakage, or sealing mismatch disrupts production and raises cost per hour. Our stainless steel flanges resist those risks using verified raw grades and consistent face finishes. 
They perform under corrosive fluids, thermal shifts, and aggressive clean-in-place routines. We supply them ready for immediate fitment into ASME, EN, or mixed-standard process lines. 

stainless steel flanges

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Having Doubts? Our FAQ

Check all our Frequently Asked Question

Can your stainless steel flanges be used for both ASME and EN standard lines?

Yes, we machine to both ASME B16.5 and EN 1092-1 dimensions with verified tolerance matching. This supports direct fitment in global systems without field rework. You can request mixed-standard documentation when needed.

How do you prevent galling on flange threads during installation?

We use stainless grades with proper hardness balance and apply non-galling thread treatments. This helps avoid seizure during bolt tightening, especially with A193 B8/B8M bolts. It ensures smoother assembly and reusability during maintenance cycles.

Are your flanges ready for chloride-sensitive applications like RO systems?

Yes, we use low-carbon 316L and Duplex options and exclude any chloride-containing gaskets. Each batch passes ASTM G48 testing to verify crevice and pitting resistance. This ensures safe use in desalination and water purification plants.

Do you offer surface finish options for hygienic or food-grade systems?

We offer 8-16 μin Ra finishes with electropolishing for clean-in-place piping. These meet hygienic requirements under FDA and EU standards. Finish quality is verified using profilometers before shipment.

Can you support oversized custom flanges beyond standard sizes?

Yes, we manufacture flanges up to 120 inches (DN3000) on request using forged rings. Machining is done on CNC vertical lathes with ±0.5 mm dimensional control. This allows integration in large vessel, tower, or ducting applications without joint mismatch.

Do Frigate support fast-track production for urgent shutdown or replacement requirements?
  • Yes, Frigate offers expedited manufacturing for critical shutdown scenarios 
  • Dedicated production slots ensure reduced lead times without compromising quality 
  • Priority machining and inspection workflows are activated for urgent orders 
  • We coordinate closely with your team to meet installation deadlines 
Can Frigate provide complete flange packages with matching fasteners and gaskets?
  • Yes, we supply full flange kits including bolts, nuts, washers, and compatible gaskets 
  • All components are matched for material compatibility and pressure class 
  • Pre-kitted solutions reduce sourcing complexity and installation errors 
  • Documentation includes full traceability across all supplied items 
How does Frigate ensure consistency across bulk or repeat flange orders?
  • We maintain strict batch control and heat traceability for every production run 
  • CNC programs and machining parameters are standardized for repeatability 
  • Inspection reports are benchmarked against previous orders for consistency 
  • Long-term customers benefit from locked specifications and production records 
Can you customize flange marking, tagging, or packaging for project requirements?
  • Yes, we offer custom stamping, barcoding, and tagging as per client specifications 
  • Project-specific identification supports site handling and QA processes 
  • export packaging, seaworthy packing, and palletization options available 
  • Documentation can be aligned with EPC or project compliance formats 
What support does Frigate provide during installation or commissioning?
  • We provide technical guidance on flange selection, torque values, and assembly practices 
  • Installation recommendations help prevent leakage and misalignment issues 
  • Material and certification documents are supplied for QA/QC verification 
  • Our engineering team is available for consultation during critical project phases 
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LOCATIONS

Registered Office

10-A, First Floor, V.V Complex, Prakash Nagar, Thiruverumbur, Trichy-620013, Tamil Nadu, India.

Operations Office

9/1, Poonthottam Nagar, Ramanandha Nagar, Saravanampatti, Coimbatore-641035, Tamil Nadu, India. ㅤ

Other Locations

  • Bhilai
  • Chennai
  • India
  • Germany
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LOCATIONS

Registered Office

10-A, First Floor, V.V Complex, Prakash Nagar, Thiruverumbur, Trichy-620013, Tamil Nadu, India.

Other Locations

  • Bangalore
  • Chennai
  • India
  • Germany
Become a Frigatian
Become a Supplier

GENERAL ENQUIRIES

  • +91 96778 64606
  • manufacture@frigate.ai
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Stainless Steel Flanges

Need reliable wires and cables for your next project? Get in touch with us today, and we’ll help you find exactly what you need!

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Stainless Steel Flanges

Need reliable Machining for your next project? Get in touch with us today, and we’ll help you find exactly what you need!

Get Latest Price

Get Price Form