ISO 7005 Flanges Suppliers

Dimensions & Pressure Classes

ISO 7005 Flanges Suppliers

ISO 7005 Standard Flanges: Dimensions | Specifications | Material Grade | Standards | About ISO 7005 | All Product Types

The ISO 7005 flange standard is globally recognized for defining the design, dimensions, pressure classes, and face types of metallic flanges used in piping systems. It is segmented into three main parts based on material:

  • ISO 7005-1 for steel flanges
  • ISO 7005-2 for grey and ductile cast iron flanges
  • ISO 7005-3 for copper alloy flanges

Each section outlines precise tolerances, bolt circle diameters, flange thickness, and pressure-temperature ratings, making ISO 7005 flanges widely compatible with PN-rated piping systems across Europe, the Middle East, and Asia.

ISO 7005 flanges are available in Weld Neck, Slip-On, Blind, Threaded, and Loose (Lap Joint) types, conforming to PN pressure classes including PN6, PN10, PN16, PN25, and PN40. Face types such as Raised Face (RF), Flat Face (FF), and Ring Type Joint (RTJ) are defined as per application and sealing requirements. These flanges ensure high integrity sealing, reduced vibration fatigue, and safe operation under varying pressure conditions.

Engineered for pumping stations, chemical plants, food-grade pipelines, desalination units, HVAC, and shipbuilding, ISO 7005 flanges are ideal when installation and service reliability are crucial. The flanges are manufactured with machined surface finishes, gasket compatibility, and leak-proof bolting systems to ensure efficient flow control in European PN piping systems.

All flange types under ISO 7005 are designed to fit seamlessly with DIN and EN 1092-1 flange systems, yet provide a distinct ISO-standard approach in tolerances and pressure handling. Their standardization and ease of integration make them essential components in globally supplied projects.

ISO 7005 Flanges Manufactured as per Part 1, 2 & 3 – Covering Weld Neck, Slip On, Blind & Threaded Types in PN6 to PN40 Pressure Classes.

For complete technical details, including dimensions, pressure rating classes, weight charts, sizes, tolerances, and material specifications of our ISO 7005 Standard Flanges, please download the full Catalog PDF below.

Standard-Compliant ISO 7005 Flanges in Steel, Cast Iron & Copper Alloys – Designed for European PN Piping Systems in Industrial and Utility Applications.

Technical Specifications of ISO 7005

Specification Details
Standard ISO 7005-1 (Steel), ISO 7005-2 (Cast Iron), ISO 7005-3 (Copper Alloy)
Flange Types Weld Neck, Slip On, Blind, Threaded, Loose Flanges (Lap Joint), and More
Size Range DN10 to DN2000 (½″ to 80″ NB equivalent)
Pressure Ratings PN6, PN10, PN16, PN25, PN40
Face Types Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ)
Drilling Templates Compliant with ISO bolt circle & hole dimensions
Flange Thickness & Tolerances As per ISO 7005 dimensional tolerances (Part 1, 2, 3)
Testing & Inspection Hydrostatic Testing, Dimensional Check, Surface Finish, Visual Inspection
Surface Finish Stock Finish (3.2–6.3 μm), Smooth, Serrated Spiral, Concentric Serration
Certification ISO 9001, EN 10204 3.1 / 3.2, PED 2014/68/EU
Applications Water Treatment, HVAC, Food Processing, Oil & Gas, Shipbuilding, Chemical Plants
Origin Made in India (by Nutech Overseas)
Export Network USA, Europe, and Middle East

Complete Material Grade Chart - ISO 7005-1

Material Category ISO 7005-2 Flange Grades
Stainless Steel ISO 7005 Flange ASTM A182 F304 / F304L / F304H, F316 / F316L / F316Ti, F310, F309S, F317 / F317L, F321 / F321H, F347 / F347H, F904L, ASTM A351 CF3 / CF3M / CF8 / CF8M / CF8C, DIN 1.4301, 1.4306, 1.4307, 1.4311, 1.4401, 1.4404, 1.4408, 1.4409, 1.4541, 1.4571, 1.4550, 1.4435, 1.4539
Duplex Steel ISO 7005 Flange ASTM A182 F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61, UNS S31803 / S32205
Super Duplex Steel ISO 7005 Flange ASTM A182 F53 / F55 / F57 / F59 / F60 / F61, UNS S32750 / S32760
Carbon Steel ISO 7005 Flange ASTM A105 / A105N, ASTM A350 LF2, ASTM A694 F52 / F56 / F60 / F65 / F70 / F80, ASTM A216 WCB, DIN 1.0460 / 1.0402 / 1.0619, Die Steel, Mild Steel
Alloy Steel ISO 7005 Flange ASTM A182 F5 / F9 / F11 / F12 / F22 / F91, AISI 4130 / 4140
Nickel Alloy ISO 7005 Flange Nickel 200 / 201, ASTM B564
Monel ISO 7005 Flange Monel 400 (UNS N04400), Monel K500 (UNS N05500), ASTM B564
Inconel ISO 7005 Flange Inconel 600 / 601 / 625 / 690 / 718 / 783 / X750, ASTM B564
Incoloy ISO 7005 Flange Incoloy 800 / 800H / 800HT (UNS N08800), Incoloy 825 (UNS N08825), Incoloy 925, ASTM B564
Hastelloy ISO 7005 Flange Hastelloy C276 (UNS N10276), C22 (UNS N06022), C4, C2000, B2, B3, X, ASTM B564
Alloy 20 ISO 7005 Flange Alloy 20 / 20Cb-3, Carpenter® 20, ASTM B462
254 SMO ISO 7005 Flange SMO 254 / 6Mo, UNS S31254, DIN 1.4547, ASTM A182
Copper Nickel ISO 7005 Flange Copper Nickel 90/10 (C70600), 70/30 (C71500), UNS C71640, ASTM B61 / B62 / B151 / B152
Copper ISO 7005 Flange TP1, TP2, T1, T2, C10100–C12300, C14200–C17200, C21000–C71520, including C10930, C11000, C11400, C12000, C12200, C26000, C28000, C33000, C44300, C70600, etc.
Brass ISO 7005 Flange Grades 3602, 2604, H59, H62, etc.
Aluminium ISO 7005 Flange Aluminium Grades 5052, 6061, 6063, 2017, 7075, etc.
Titanium ISO 7005 Flange ASTM B381 Gr.1 / Gr.2 / Gr.4 / Gr.5 / Gr.7, UNS R50250 / R50400 / R50550 / R50700 / R52400 / R53400 / R56320 / R56400
Other Special Grades Al6XN, Tin Bronze, Aluminium Bronze, Lead Bronze, Nimonic 75 / 80A / 90

International Flange Standards We Manufacture & Supply

How to identify PN rating on ISO 7005 flanges and what does it signify?

The PN rating (Pressure Nominal) on ISO 7005 flanges indicates the maximum pressure (in bars) that a flange can withstand at a reference temperature of 20°C. It's a critical factor in selecting the right flange for your piping system.

PN Rating Breakdown:

  • PN6 – Low-pressure applications (e.g., HVAC, water supply)
  • PN10 & PN16 – Standard for general utility and industrial pipelines
  • PN25 & PN40 – High-pressure pipelines (steam lines, process industries)

How to identify it:

  • Marking on the flange face or outer rim includes “PN” followed by the number (e.g., PN16)
  • It is usually accompanied by the DN (Diameter Nominal) and material grade

Why it matters:

  • Ensures safe pressure containment
  • Helps match gaskets, bolts, and mating flanges
  • Critical for maintaining pipeline integrity in demanding environments

Always choose the PN class based on system design pressure and temperature, not just pipe diameter.

Are ISO 7005 flanges interchangeable with EN 1092-1 flanges?

Yes, in most cases, ISO 7005-1 flanges are technically interchangeable with EN 1092-1 flanges, as both standards share similar dimensional specifications and are often harmonized in European and international markets.

However, there are some considerations:

Key Points of Compatibility:

  1. Bolt Circle Diameter, Flange Thickness, and Drilling Pattern are typically the same
  2. Both standards support the same PN pressure ratings: PN6, PN10, PN16, PN25, PN40
  3. Face types (RF, FF) and gasket compatibility are generally identical

When Interchangeability May Not Apply:

  1. Material specifications or inspection requirements may differ
  2. Some localized manufacturing tolerances might vary slightly
  3. Certain industries (like offshore or power generation) demand strict standard-specific compliance

Pro Tip: When replacing or combining ISO 7005 and EN 1092-1 flanges, ensure all design parameters, material grades, and pressure-temperature charts align correctly for system safety.

How are ISO 7005 flange face types categorized and selected for different applications?

ISO 7005 flanges are manufactured with specific face types to ensure effective sealing between piping components. Choosing the correct face type is essential for gasket compatibility, system pressure integrity, and leak prevention.

Common ISO 7005 Face Types:

  • Raised Face (RF):
    • Most widely used
    • Suitable for high-pressure and high-temperature applications
    • Compatible with spiral wound, metal jacketed, and standard gaskets
  • Flat Face (FF):
    • Used in low-pressure systems or where mating with cast iron equipment
    • Requires full-face gaskets
  • Ring Type Joint (RTJ):
    • For critical applications involving extreme pressure or temperature
    • Requires a machined metal ring gasket seated in a groove

Selection Tips:

  • Media Type: Fluids, gases, steam, etc.
  • Operating Pressure & Temperature
  • Mating Equipment Material
  • Gasket Type & Availability

Correct flange face selection ensures leak-free connections, reduces maintenance, and improves system reliability.

What testing and inspection procedures are followed for ISO 7005 flanges?

ISO 7005 flanges are subject to strict quality control and inspection protocols to ensure compliance with pressure containment, dimensional accuracy, and safety standards.

Common Testing & Inspection Methods:

  1. Hydrostatic Pressure Test

    Ensures the flange can withstand rated pressure without leakage or deformation.

  2. Dimensional Inspection

    Verified against ISO 7005 tolerances for OD, bolt circle diameter, thickness, and bore.

  3. Material Test Reports (MTRs)

    Include chemical composition and mechanical properties, traceable to the heat number.

  4. Nondestructive Testing (NDT) (on request or as per client spec):
    • Ultrasonic Testing (UT)
    • Magnetic Particle Inspection (MPI)
    • Dye Penetrant Test (DPT)
  5. Visual Inspection

    Final QC check for surface finish, face flatness, bolt hole alignment, and coating quality.

Certifications Provided:

  • EN 10204 Type 3.1 or 3.2
  • ISO 9001 compliance
  • PED / NORSOK / NACE certification (if applicable)

Testing ensures the flanges are fit for high-integrity applications in oil & gas, water treatment, chemical plants, and marine systems.

What are the key tolerances and machining specifications for ISO 7005 flanges?

ISO 7005 flanges are manufactured with precise tolerances and machining guidelines to ensure proper sealing, bolt alignment, and interchangeability in international piping systems.

Key Tolerance Aspects:

  • Bolt Hole Alignment:
    • Tolerance on pitch circle diameter (PCD) and hole spacing must adhere to ISO 286-2 fits.
    • Misalignment beyond limits can result in torque issues and improper gasket seating.
  • Facing Finish:
    • Raised Face (RF) or Flat Face (FF) finishes typically range from Ra 3.2 to 6.3 μm, following spiral or concentric serration patterns for optimal gasket grip.
  • Flange Thickness & OD:
    • Controlled within ±1 mm or less, depending on PN rating and size.
    • Ensures compatibility with mating flanges and accurate pressure handling.
  • Hub Bore & Bevel (for welding necks):
    • Machined to match pipe OD + wall thickness.
    • Ensures full-penetration welds and structural strength.
  • Flatness Tolerance:
    • Generally within 0.3 mm for diameters less-than 600 mm; critical for sealing integrity.

Compliance Reference:

All tolerances and machining specs comply with ISO 7005-1, ISO 7005-2, and respective material standards (e.g., ISO 9624 for steel flanges).

Which countries does Nutech Overseas export ISO 7005 flanges to?

Nutech Overseas is a trusted global exporter of ISO 7005 standard flanges, delivering precision-engineered solutions to over 40 countries across various industries. Our strong logistic network and compliance with international certifications enable us to serve critical applications worldwide.

Key Export Destinations:

  • Europe: Germany, Italy, Spain, France, Netherlands, Poland, UK
  • Middle East: UAE, Saudi Arabia, Oman, Qatar, Kuwait, Iraq
  • Asia-Pacific: Singapore, Indonesia, Malaysia, South Korea, Vietnam
  • Africa: South Africa, Egypt, Nigeria
  • Americas: USA, Mexico, Brazil, Argentina, Canada
  • Oceania: Australia, New Zealand

Why Global Clients Prefer Nutech:

  • Adherence to ISO 7005 and EN standards
  • Full traceability with EN 10204 3.1 / 3.2 certifications
  • On-time delivery with customized packaging
  • Competitive pricing with quality assurance

We support OEMs, EPC contractors, and industrial buyers in sectors like oil & gas, petrochemicals, shipbuilding, water treatment, and renewable energy projects.

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