EN 1092-1 / DIN Stainless Steel Flanges
Sunhyings manufactures a comprehensive range of European standard stainless steel flanges, fully compliant with the modern EN 1092-1 (Euro Norm) and the legacy DIN (Deutsches Institut für Normung) standards. We provide precision-engineered solutions for piping systems across Europe and global industries requiring metric standard components, available in grades 304/304L (1.4301/1.4307) and 316/316L (1.4404).
Understanding the Transition: Historically, DIN standards (such as DIN 2501, DIN 2633, and DIN 2576) were the benchmark for German industrial flanges. These have now been superseded by EN 1092-1 to unify European standards. While EN 1092-1 is the current standard, we understand that many maintenance projects and existing systems still reference DIN specifications.
Whether your project requires the latest EN 1092-1 Type 11 (Weld Neck) or a replacement for an old DIN 2633 flange, our manufacturing process ensures seamless interchangeability. We pay special attention to critical details—such as the bolt hole differences in DN65 PN16—to ensure the flanges you receive fit your pipelines perfectly.
Types of EN 1092-1 / DIN Flanges We Supply
Stainless Steel Flanges
By Design Type
By Standard & Class
Advanced Materials
Why Choose Sunhy for EN 1092-1 / DIN Flanges?
1. Precision Engineering & Fitment
We don’t just “match” dimensions; we guarantee them. Our flanges strictly adhere to EN 1092-1 tolerances for bolt hole alignment and facing flatness. Whether you need a standard Type 11 or a custom-machined DIN 2633 replacement, we ensure 100% compatibility with your existing European piping systems.
2. Certified Material Integrity
Fake or low-grade steel is a major industry risk. We provide full traceability for every flange, from raw billet to finished product. All orders come with EN 10204 3.1 Mill Test Certificates (MTC), verifying the chemical composition and mechanical properties of our 1.4301 (304) and 1.4404 (316L) stainless steel.
3. Superior Surface Finish
A leak-proof seal depends on the flange face. We utilize advanced CNC machining to produce the standard Type B1 (Raised Face) finish with the correct roughness (Ra 3.2-12.5 µm), ensuring optimal gasket seating and sealing performance under pressure ratings from PN6 to PN100.
4. Global Export Ready
With years of experience serving markets in Europe, Asia, and South America, we understand the nuances of international shipping and packaging. We ensure your DIN/EN flanges are protected against corrosion and damage during transit, arriving ready for immediate installation.
What is an EN 1092-1 / DIN Flange?
The DIN flange (Deutsches Institut für Normung) is the original German standard for pipe connections, widely used across Europe. The EN 1092-1 flange is the modern European Standard (Euronorm) that has officially replaced the national DIN standards to unify specifications across EU countries.
In practice, they are often referred to interchangeably. For example, a legacy DIN 2633 flange is technically equivalent to the modern EN 1092-1 Type 11, though minor dimensional differences (like DN65 bolt holes) exist.
Need a Quote for EN/DIN Flanges?
Send us your inquiry list with either Old DIN Numbers (e.g., DIN 2633) or New EN Types (e.g., Type 11).
We will handle the cross-reference and quote you within 24 hours.
📧 Or email us directly at: anna@sunhying.com
DIN to EN 1092-1 Cross Reference & Conversion Guide
The transition from national DIN standards to the unified European EN 1092-1 standard can be confusing. Use the table below to identify the correct EN 1092-1 Type based on the legacy DIN number you are familiar with. This guide covers common pressure ratings including PN6, PN10, PN16, PN25, and PN40.
⚠️ Critical Engineering Note: DN65 Bolt Holes
While EN 1092-1 is largely compatible with DIN, there is a critical difference for DN65 PN16 flanges:
- Old DIN 2501 / DIN 2633: Specifies 4 bolt holes (M16).
- New EN 1092-1: Specifies 8 bolt holes (M16).
Ordering Tip: If you are replacing a flange on an existing legacy system, please count the bolt holes before ordering. Sunhyings can manufacture both 4-hole and 8-hole versions upon request to ensure fitment.
| Flange Description | Legacy DIN Standard (Old) | New EN 1092-1 Type | Common Application |
|---|---|---|---|
| Slip-On / Plate Flange | DIN 2573 (PN6) DIN 2576 (PN10) |
Type 01 | Flat Plate for welding |
| Blind Flange | DIN 2527 (All PN) | Type 05 | Closing pipe ends |
| Weld Neck Flange |
DIN 2631 (PN6) DIN 2632 (PN10) DIN 2633 (PN16) DIN 2635 (PN40) |
Type 11 | High pressure & critical lines |
| Loose Flange (Lapped / Backing) |
DIN 2641 (PN6) DIN 2642 (PN10) |
Type 02 | Used with Collars |
| Threaded Flange | DIN 2566 | Type 13 | Screwed connection |
Common Dimensions: EN 1092-1 Type 11 / DIN 2633 (PN16)
The Weld Neck Flange (Type 11) is the most requested specification. Below are critical dimensions for the PN16 series.
| DN (mm) | Pipe OD (mm) | Flange OD (D) | Thickness (b) | Bolt Circle (k) | Bolt Holes (Qty x Size) |
|---|---|---|---|---|---|
| DN 25 | 33.7 | 115 | 18 | 85 | 4 x M12 |
| DN 50 | 60.3 | 165 | 20 | 125 | 4 x M16 |
| DN 65* | 76.1 | 185 | 22 | 145 | 8 x M16 (EN) / 4 x M16 (DIN) |
| DN 100 | 114.3 | 220 | 24 | 180 | 8 x M16 |
| DN 150 | 168.3 | 285 | 26 | 240 | 8 x M20 |
Technical Specifications & Product Range
Sunhy flanges are manufactured to precise European standards, ensuring full compatibility with PN-rated piping systems. Below are our standard production capabilities.
- Materials (Stainless Steel):
- ASTM/ASME: A182 F304 / F304L, F316 / F316L
- EN/DIN Equivalent: 1.4301 / 1.4307 (304/L), 1.4404 (316L), 1.4571 (316Ti)
- Pressure Ratings (PN):
- Standard Stock: PN6, PN10, PN16, PN25, PN40
- High Pressure: PN63, PN100 (Available upon request)
- Facing Types (Surface Finish):
- Type B1 (Raised Face): Standard usage (Replaces DIN Form C).
- Type A (Flat Face): For mating with cast iron valves or flat flanges.
- Other facings: Type C (Tongue), Type D (Groove) available.
- Size Range: DN15 (1/2″) to DN2000 (80″)
*Note: For full dimensional charts covering all sizes (DN15-DN2000) and pressure ratings (PN6-PN100), please contact our engineering team.
FAQ
Can I use EN 1092-1 flanges to replace old DIN flanges?
Generally, EN 1092-1 flanges are interchangeable with legacy DIN flanges (such as DIN 2501, 2633) regarding the pitch circle diameter (PCD) and mating dimensions.1 However, they are not universally identical. Critical differences exist for specific sizes—most notably DN65 PN16—and in the surface finish requirements (Ra vs Rz).2
Key Differences: DIN vs. EN 1092-1 2
| Feature | DIN Standard (Old) | EN 1092-1 (New) | Interchangeability Status |
| DN65 PN16 Bolt Holes | 4 Holes 5 | 8 Holes (Standard) 7 | NOT Interchangeable (Unless 4-hole variant specified). |
| Sealing Face | Form C (Roughness Rz 40-160) | Form B1 (Roughness Ra 3.2-12.5) 9 | Conditional (Check gasket compatibility). |
| Flange Thickness | Varies by standard | Often thicker in EN | Check clearance for bolts.1 |
| Pressure Rating | DIN 2633 = PN16 | Type 11 = PN16 | Ratings generally align. |
Engineering Note: For DN65 PN16 replacements, you must explicitly request “4-hole execution” to match legacy DIN equipment. Failure to do so will result in an 8-hole flange that cannot be installed.8
What does “PN” mean in flange standards?
PN stands for Pressure Nominal. It is a standardized class designation (e.g., PN16, PN40) used in EN 1092-1 to indicate the nominal pressure resistance of a flange in bars at a reference temperature of 20°C.
It is important to note that PN is not the maximum working pressure at all temperatures. As operating temperature increases, the maximum allowable pressure decreases (derating). For example, a PN16 carbon steel flange may withstand 16 bar at room temperature, but only approx. 12.0 bar at 200°C (depending on the material, such as 1.0404). Engineers must consult Pressure-Temperature (P-T) rating tables to verify safety at operating conditions.
Do your flanges come with Material Certificates?
Yes, our flanges are supplied with material certifications in accordance with EN 10204. It is critical to select the correct type based on your project’s safety requirements:
EN 10204 Type 3.1 (Standard): This certificate declares that the products supplied are in compliance with the order and includes specific test results. It is validated by the manufacturer’s authorized inspection representative, who is independent of the manufacturing department. This is suitable for standard industrial piping.
EN 10204 Type 3.2 (Critical Safety): This provides the highest level of verification. The certificate is validated by both the manufacturer’s representative and an independent Third Party Inspector (TPI) (e.g., TÜV, Lloyds, DNV). This type is required for high-pressure, subsea, or nuclear applications where independent witnessing of tests is mandatory.
We typically supply Type 3.1 as standard. If Type 3.2 is required, please specify this at the inquiry stage to arrange for third-party witnessing.