Dimensions & Pressure Classes
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:
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.
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.
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 |
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 |
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:
How to identify it:
Why it matters:
Always choose the PN class based on system design pressure and temperature, not just pipe diameter.
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:
When Interchangeability May Not Apply:
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.
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:
Selection Tips:
Correct flange face selection ensures leak-free connections, reduces maintenance, and improves system reliability.
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:
Ensures the flange can withstand rated pressure without leakage or deformation.
Verified against ISO 7005 tolerances for OD, bolt circle diameter, thickness, and bore.
Include chemical composition and mechanical properties, traceable to the heat number.
Final QC check for surface finish, face flatness, bolt hole alignment, and coating quality.
Certifications Provided:
Testing ensures the flanges are fit for high-integrity applications in oil & gas, water treatment, chemical plants, and marine systems.
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:
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).
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:
Why Global Clients Prefer Nutech:
We support OEMs, EPC contractors, and industrial buyers in sectors like oil & gas, petrochemicals, shipbuilding, water treatment, and renewable energy projects.