EN Flanges
EN Flange: Specifications | Materials | Dimensions | Weight Chart | Tolerances | FAQ
EN Flanges Manufacturer and Supplier in USA, Germany, UAE, India, and South Korea offering Weld Neck, Slip-On, Blind, Threaded, and Lap Joint flanges in Carbon, Stainless, and Alloy Steel as per EN 1092-1 standards for industrial, oil & gas, petrochemical, chemical, and power plant piping systems.
Best Export Prices: sales@midlandforgefittings.com
Midland Forge Fittings is a leading manufacturer and supplier of precision-engineered EN flanges, specializing in high-performance solutions for industrial piping systems. Our products are crafted to meet stringent international standards, ensuring exceptional durability, dimensional accuracy, and mechanical integrity across critical applications in oil & gas, petrochemical, and power plant industries.
Our commitment to quality extends from material selection to forging, machining, and inspection, allowing us to deliver reliable and consistent components that withstand high pressure, extreme temperatures, and corrosive environments. By combining advanced manufacturing technology with experienced engineering, we provide EN 1092-1 flanges that meet the most demanding specifications worldwide.
EN Flanges, manufactured according to EN 1092-1 standards, provide precise dimensional conformity, pressure rating compliance, and full traceability. Available in Weld Neck, Slip-On, Blind, Threaded, and Lap Joint types, they are designed for seamless integration into industrial piping systems. EN Flanges are offered in Carbon Steel, Stainless Steel, and Alloy Steel grades, supporting applications in high-pressure and high-temperature environments.
These flanges feature strict tolerances for outside diameter, thickness, bolt circle, and raised face dimensions, ensuring leak-proof connections and safe operation. With comprehensive weight charts, dimensional data, and material certifications, EN Flanges from Midland Forge Fittings provide engineers and designers with reliable, technically verified components suitable for critical piping networks worldwide.
EN Flange - Specifications
EN Flange PN 6 to PN 40 - Materials, Grades & Standards
| Pressure Rating (PN) |
Material | Grade / Standard |
Applications | Remarks |
|---|---|---|---|---|
| PN 6 | Carbon Steel | EN 10025-2, S235JR | Low-pressure pipelines, water lines |
Suitable for mild operating conditions |
| PN 6 | Stainless Steel | EN 1.4301 (304), EN 1.4404 (316L) | Chemical, food processing, low-pressure systems |
Corrosion-resistant |
| PN 10 | Carbon Steel | EN 10025-2, S275JR | Industrial, HVAC, moderate-pressure pipelines |
Standard low-pressure industrial usage |
| PN 10 | Stainless Steel | EN 1.4301 (304), EN 1.4404 (316L) | Petrochemical, chemical pipelines |
Good corrosion resistance |
| PN 16 | Carbon Steel | EN 10025-2, S355JR | Moderate-pressure industrial pipelines |
Commonly used in oil & gas, water, chemical |
| PN 16 | Stainless Steel | EN 1.4301 (304), EN 1.4404 (316L) | Petrochemical, chemical, power plants |
Corrosion and temperature-resistant |
| PN 25 | Carbon Steel | EN 10222-2, P265GH | High-pressure oil & gas pipelines |
Suitable for higher stress and pressure |
| PN 25 | Stainless Steel | EN 1.4404 (316L) | Chemical and high-pressure applications |
Excellent corrosion and temperature performance |
| PN 40 | Carbon Steel | EN 10222-2, P355GH | High-pressure pipelines in oil, gas, power |
Heavy-duty industrial applications |
| PN 40 | Alloy Steel | EN 10222-5, 13CrMo44 | High-pressure, high-temperature environments |
Heat and pressure resistant |
EN Standard Flanges – Dimensions
| DN / NB | PN | Flange Type | Outside Diameter (OD, mm) | Thickness / Face-to-Face (mm) | Bolt Circle Diameter (BCD, mm) | No. of Bolt Holes | Bolt Hole Diameter (mm) | Raised / Flat Face Height (mm) |
|---|---|---|---|---|---|---|---|---|
| 15 (1/2″) | PN 6-40 | WN | 95 | 14-24 | 65-95 | 4 | 14 | 2-3 |
| 15 (1/2″) | PN 6-40 | SO | 95 | 10-20 | 65-95 | 4 | 14 | 2-3 |
| 15 (1/2″) | PN 6-40 | BL | 95 | 12-22 | 65-95 | 4 | 14 | 2-3 |
| 15 (1/2″) | PN 6-40 | TH | 95 | 12-22 | 65-95 | 4 | 14 | 2-3 |
| 15 (1/2″) | PN 6-40 | LJ | 95 | 10-20 | 65-95 | 4 | 14 | 2-3 |
| 50 (2″) | PN 6-40 | WN | 165 | 18-28 | 125-145 | 8 | 18 | 2-3 |
| 50 (2″) | PN 6-40 | SO | 165 | 16-26 | 125-145 | 8 | 18 | 2-3 |
| 50 (2″) | PN 6-40 | BL | 165 | 20-30 | 125-145 | 8 | 18 | 2-3 |
| 50 (2″) | PN 6-40 | TH | 165 | 18-28 | 125-145 | 8 | 18 | 2-3 |
| 50 (2″) | PN 6-40 | LJ | 165 | 16-26 | 125-145 | 8 | 18 | 2-3 |
| 100 (4″) | PN 6-40 | WN | 220 | 22-36 | 180-200 | 8 | 18-20 | 2-3 |
| 100 (4″) | PN 6-40 | SO | 220 | 20-34 | 180-200 | 8 | 18-20 | 2-3 |
| 100 (4″) | PN 6-40 | BL | 220 | 28-40 | 180-200 | 8 | 18-20 | 2-3 |
| 100 (4″) | PN 6-40 | TH | 220 | 24-38 | 180-200 | 8 | 18-20 | 2-3 |
| 100 (4″) | PN 6-40 | LJ | 220 | 22-36 | 180-200 | 8 | 18-20 | 2-3 |
| 1200 (48″) | PN 6-40 | WN | 2200 | 80-120 | 2100-2150 | 48 | 36 | 5-10 |
| 1200 (48″) | PN 6-40 | SO | 2200 | 70-110 | 2100-2150 | 48 | 36 | 5-10 |
| 1200 (48″) | PN 6-40 | BL | 2200 | 100-140 | 2100-2150 | 48 | 36 | 5-10 |
| 1200 (48″) | PN 6-40 | TH | 2200 | 90-130 | 2100-2150 | 48 | 36 | 5-10 |
| 1200 (48″) | PN 6-40 | LJ | 2200 | 80-120 | 2100-2150 | 48 | 36 | 5-10 |
EN Forged Flanges - Weight Chart
| DN / NB | Flange Type | PN | Weight (kg) |
|---|---|---|---|
| 15 (1/2″) | WN | 6-40 | 1.5 – 2.5 |
| 15 (1/2″) | SO | 6-40 | 1.2 – 2.0 |
| 15 (1/2″) | BL | 6-40 | 1.8 – 2.8 |
| 15 (1/2″) | TH | 6-40 | 1.6 – 2.5 |
| 15 (1/2″) | LJ | 6-40 | 1.2 – 2.0 |
| 50 (2″) | WN | 6-40 | 5 – 8 |
| 50 (2″) | SO | 6-40 | 4 – 7 |
| 50 (2″) | BL | 6-40 | 6 – 9 |
| 50 (2″) | TH | 6-40 | 5 – 8 |
| 50 (2″) | LJ | 6-40 | 4 – 7 |
| 100 (4″) | WN | 6-40 | 15 – 25 |
| 100 (4″) | SO | 6-40 | 12 – 20 |
| 100 (4″) | BL | 6-40 | 18 – 28 |
| 100 (4″) | TH | 6-40 | 16 – 26 |
| 100 (4″) | LJ | 6-40 | 12 – 20 |
| 300 (12″) | WN | 6-40 | 120 – 180 |
| 300 (12″) | SO | 6-40 | 90 – 150 |
| 300 (12″) | BL | 6-40 | 150 – 220 |
| 300 (12″) | TH | 6-40 | 130 – 200 |
| 300 (12″) | LJ | 6-40 | 90 – 150 |
| 600 (24″) | WN | 6-40 | 500 – 750 |
| 600 (24″) | SO | 6-40 | 400 – 700 |
| 600 (24″) | BL | 6-40 | 600 – 900 |
| 600 (24″) | TH | 6-40 | 500 – 800 |
| 600 (24″) | LJ | 6-40 | 400 – 700 |
| 1200 (48″) | WN | 6-40 | 2800 – 4000 |
| 1200 (48″) | SO | 6-40 | 2500 – 3800 |
| 1200 (48″) | BL | 6-40 | 3000 – 4200 |
| 1200 (48″) | TH | 6-40 | 2800 – 4000 |
| 1200 (48″) | LJ | 6-40 | 2500 – 3800 |
EN Piping Flanges - Tolerances
| Parameter | Tolerance / Limit | Remarks |
|---|---|---|
| Outside Diameter (OD) | ± 1% of nominal diameter | Ensures proper alignment with mating flanges |
| Bolt Circle Diameter (BCD) | ± 1% | Maintains uniform bolt fitment and stress distribution |
| Number of Bolt Holes | ± 0 (Exact) | EN standard requires precise hole count |
| Bolt Hole Diameter | ± 0.5 mm | To allow correct bolt insertion without play |
| Flange Thickness / Face-to-Face | +12.5% / -0% | Ensures minimum wall thickness for pressure rating |
| Raised Face (RF) Height | ± 1 mm | Provides proper gasket seating for leak-proof sealing |
| Flatness (Flange Face) | ≤ 0.5 mm | Critical for leak-tight joint in high-pressure systems |
| Out-of-Roundness | ≤ 1.5% of nominal OD | Prevents misalignment during installation |
| Concentricity / Centering | ≤ 1% of nominal OD | Maintains proper pipe alignment and stress distribution |
| Machining Surface Finish | Ra 3.2 μm (typical) | Ensures gasket sealing and smooth contact surface |
| Angular Tolerance (for Weld Neck) | ≤ 1° | Ensures correct alignment with welded pipes |
What are the different types of EN Flanges (with Type Numbers)?
EN Flanges are categorized under EN 1092-1 standard types, each serving a specific piping purpose:
- Type 05 – Blind Flange (BL):
- Used to close pipeline ends, pressure test, or isolate sections.
- Type 11 – Weld Neck Flange (WN):
- Designed for butt-welded connections, ideal for high-pressure and high-temperature applications.
- Type 12 – Long Weld Neck Flange:
- Extended neck provides additional stress distribution in pipelines.
- Type 13 – Threaded Flange (TH):
- Can be screwed onto pipes without welding, suitable for low-pressure systems.
- Type 21 – Slip-On Flange (SO):
- Pipes slip into the flange, easy to install and suitable for moderate pressures.
- Type 22 – Lap Joint Flange (LJ):
- Works with stub ends, ideal for systems that require frequent dismantling or maintenance.
- Type 23 / 24 – Reducing Flanges / Special Flanges:
- Custom flanges for connecting different pipe sizes or high-performance applications.
Key Points:
- Flanges are available in Carbon Steel, Stainless Steel, and Alloy Steel.
- Each type has specific dimensional, bolt, and pressure specifications as per EN 1092-1.
- Choosing the correct flange type ensures system integrity, leak-proof sealing, and operational safety.
What are the pressure ratings of EN Flanges?
EN Flanges are designed for PN 6 to PN 40 pressure classes, covering low to high-pressure systems:
- PN 6: Low-pressure pipelines, water supply, and general industrial applications.
- PN 10: Moderate-pressure chemical and HVAC systems.
- PN 16: Common for moderate to high-pressure pipelines in petrochemical and industrial applications.
- PN 25: High-pressure pipelines in oil & gas, chemical, and power plants.
- PN 40: Heavy-duty applications in high-pressure, high-temperature industrial systems.
What are the main advantages of using EN Flanges?
- Standardized dimensions for interchangeability.
- Wide variety of types for all industrial needs (WN, SO, BL, TH, LJ).
- High-pressure and temperature resistance suitable for PN 6–PN 40.
- Compatibility with Carbon Steel, Stainless Steel, and Alloy Steel pipelines.
- Leak-proof connections due to precise tolerances and surface finishes.
- Suitable for critical industrial applications: oil & gas, chemical, petrochemical, power plants.