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BS 4504 Flanges

Failure to match flange specifications in critical piping leads to dangerous leaks, forced shutdowns, and high repair costs. Our BS 4504 Flanges prevent such failures with certified material grades, tight dimensional tolerances, and corrosion-resistant coatings. 
 

Standard Specification

BS 4504:1969 (PN6-PN40), BS EN 1092-1 (European replacement)

Pressure Rating

PN6, PN10, PN16, PN25, PN40

Material

Carbon Steel (BS 1501-224), Stainless Steel (BS 1501-304/316), Aluminum (BS 1470-6082)

Nominal Size

½” to 48″ (DN15 to DN1200) [BS 4504 Table 1]

Flange Type

Type 01 (Plate), Type 02 (Loose), Type 05 (Weld Neck), Type 11 (Blind)
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Product Description

Manufactured from forged carbon steel, stainless steel, or aluminum, they meet PN6 to PN40 pressure classes across DN15 to DN1200. Surface finishes, bolt patterns, and temperature ratings strictly follow BS 4504 and BS EN 1092-1 standards for global project compatibility.

Facing Type

Form B (Raised Face), Form D (Groove), Form E (Spigot) [BS 4504 Section 4]

Dimensions

BS 4504 Table 2 (OD, thickness), Table 3 (raised face)

Bolt Circle Diameter

Imperial series (e.g., DN50 PN16: 120mm) [BS 4504 Table 4]

Number & Size of Bolt Holes

Whitworth bolts (e.g., DN50 PN16: 4×½”) [BS 4504 Table 4]

Surface Finish

3.2μm Ra (gasket surfaces), 12.5μm Ra (non-contact) [BS 4504 Clause 5]

Corrosion Resistance

BS 729 (hot-dip galvanized), BS EN ISO 1461 (zinc coating)

Temperature Rating

-10°C to +300°C (carbon steel), -50°C to +600°C (stainless)

Material Certification

BS EN 10204 3.1B, PED 2014/68/EU Annex I

Gasket Compatibility

BS 3381 (spiral wound), BS 3063 (non-metallic)

Coating/Plating

Sherardizing (BS 4921), Cadmium plating (BS 1706)

Manufacturing Method

Forged (BS 1504), Cast (BS 1503), Machined from plate (BS 1501)

Technical Advantages

Standard generic flanges often mismatch in bolt circle or gasket fit, risking leaks during pressurization. Our BS 4504 Flanges follow Table 2 and Table 4 exactly, matching OD, thickness, bolt holes, and bolt circles with no tolerance stacking. 
 
Facing forms like B, D, and E ensure proper gasket seating to resist blowouts even at maximum PN40 pressure ratings. Forged construction from BS 1504 and machined surfaces with 3.2μm Ra roughness guarantee sealing performance even after repeated thermal cycling. 

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Industry Applications

Oil and Gas Pipelines

Handles pressures up to PN40 and temperatures from -10°C to +300°C, with hot-dip galvanized surfaces for long field service.

Chemical Processing Plants

Offers gasket compatibility with BS 3381 and BS 3063 standards, minimizing leakage risks in aggressive chemical environments.

Offshore Platforms

Withstands marine corrosion using BS 729 hot-dip galvanizing or ISO 1461 zinc coating, tested for 2000+ salt spray hours.

Water Treatment Facilities

Type 01 and Type 11 flanges deliver easy assembly and maintenance access for high-flow pipe systems across DN600-DN1200 ranges.

Thermal Power Stations

Maintains flange integrity under cyclic heating and cooling between -50°C and +600°C for steam and condensate lines.

Heavy Machinery Manufacturing

Custom flange marking and material certifications (BS EN 10204 3.1B) support full traceability for export-bound heavy equipment assemblies.

BS 4504 Flanges

Engineered Flanges for Heavy-Duty Piping Systems

Incorrect flange selection can lead to sealing failures, pressure loss, and shutdowns during system operation. Our BS 4504 Flanges meet strict dimensional and material standards to prevent fitment or pressure rating mismatches. 
We supply full ranges with proper certifications for carbon steel, stainless steel, and aluminum grades. Our flanges perform consistently across oil and gas, shipbuilding, chemical processing, and heavy engineering industries. 

BS 4504 Flanges

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Having Doubts? Our FAQ

Check all our Frequently Asked Question

What material certifications do your BS 4504 flanges carry?

All BS 4504 flanges come with BS EN 10204 3.1B certification for full material traceability. 
We also support PED 2014/68/EU Annex I documentation when projects demand pressure equipment compliance. Certificates are shipped together with the product to avoid any supply chain delays. 

Can you match gasket surface finish as per BS 4504 requirements?

Yes, we machine gasket surfaces to 3.2μm Ra finish as per BS 4504 standards. This ensures proper gasket compression without leakage at rated pressure classes. Non-contact surfaces maintain a 12.5μm Ra finish for cost-effective durability.

What are the available corrosion protection options for BS 4504 flanges?

We offer hot-dip galvanizing to BS 729 and zinc coating to BS EN ISO 1461. Sherardizing as per BS 4921 is also available for high-temperature environments. Coating selection depends on your application and operating conditions.

Are bolt hole dimensions and patterns strictly as per BS 4504 tables?

We manufacture bolt circles, hole sizes, and counts exactly as per BS 4504 Table 4. This ensures perfect alignment during on-site installation without any modification. Each flange undergoes inspection for bolt hole spacing and diameter accuracy.

How do you guarantee pressure and temperature ratings for supplied flanges?

We produce flanges from materials specified in BS 1501 and BS 1470 standards. Pressure ratings from PN6 to PN40 are verified through dimensional and material control. 
Temperature performance is supported by both base material properties and surface treatment.

How fast can Frigate deliver BS 4504 flanges for urgent projects?
  • Standard sizes (DN15–DN300) are available with short lead times from ready stock 
  • Expedited manufacturing options for larger diameters and special materials 
  • Dedicated production slots for emergency shutdown or maintenance requirements 
  • In-house machining and finishing reduce dependency delays 
  • Global logistics support ensures timely delivery to project sites 
Can Frigate supply customized BS 4504 flanges for non-standard applications?
  • Custom drilling, facing, and thickness modifications based on project drawings 
  • Material upgrades (duplex, super duplex, special alloys) available on request 
  • Special coatings for extreme corrosion or high-temperature environments 
  • Marking, tagging, and packaging tailored for EPC and export requirements 
  • Engineering support to validate design before production 
Does Frigate support bulk orders for large infrastructure or EPC projects?
  • Scalable manufacturing capacity for high-volume orders up to DN1200 
  • Batch-wise production planning aligned with project schedules 
  • Consistent quality maintained across all lots with strict QA/QC processes 
  • Dedicated account management for EPC contractors and OEMs 
  • Cost optimization through volume-based manufacturing efficiencies 
What quality checks does Frigate perform before dispatch?
  • Dimensional inspection as per BS 4504 Tables (OD, PCD, bolt holes) 
  • PMI (Positive Material Identification) for material verification 
  • Surface finish and coating thickness inspection 
  • Hydrostatic or pressure-related validation (if applicable) 
  • Full documentation package including test reports and certifications 
How does Frigate ensure compatibility with existing piping systems?
  • Strict adherence to BS 4504 and BS EN 1092-1 dimensional standards 
  • Cross-verification of mating flange specifications before dispatch 
  • Gasket compatibility checks based on application requirements 
  • Technical consultation to avoid mismatch in retrofit or expansion projects 
  • Proven manufacturing workflows aligned with industrial assembly standards 
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LOCATIONS

Registered Office

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

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9/1, Poonthottam Nagar, Ramanandha Nagar, Saravanampatti, Coimbatore-641035, Tamil Nadu, India. ã…¤

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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
  • Coimbatore
  • Germany
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Become a Supplier

GENERAL ENQUIRIES

  • +91 96778 64606
  • manufacture@frigate.ai
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BS 4504 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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BS 4504 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

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