Explore factory-direct forged components manufactured per DIN/EN specifications with full material certification (EN 10204 3.1/3.2).
In high-integrity process engineering, selecting the correct DIN Flange Size is fundamental to maintaining system hermeticity, structural equilibrium, and pressure containment. The Deutsches Institut für Normung (DIN) standard historical framework—now largely harmonized into European Norm EN 1092-1—provides the global benchmark for European flange dimensions, pressure ratings (PN / Pressure Nominal), face geometries, and material specs.
Historical DIN standards categorizing flange geometry by joint type—such as DIN 2573 / 2576 for Slip-on Flanges, DIN 2631 to DIN 2638 for Weld Neck Flanges, and DIN 2527 for Blind Flanges—established standardized pitch circle diameters (PCD) and bolt hole dimensions accepted globally.
Modern procurement requires precise cross-referencing between historical DIN sheets and modern EN 1092-1 types. For instance, DIN 2633 corresponds to EN 1092-1 Type 11 (Weld Neck PN16), ensuring seamless interchangeability during plant revamps and EPC expansions.
DIN flange sizing operates on bar-based pressure ratings: PN6, PN10, PN16, PN25, PN40, PN64, PN100, up to PN400. Dimensions like flange thickness (b), outer diameter (D), and hub dimensions scale dynamically to prevent bolt yield and gasket rupture under cyclic thermal stress.
The table below synthesizes key dimensional variables crucial for mechanical engineers, piping designers, and procurement managers evaluating DIN Weld Neck (DIN 2632 / DIN 2633 / DIN 2635) and Slip-On (DIN 2576) specifications.
| Nominal Size (DN) | Pipe OD (mm) | Flange OD - D (mm) | Pitch Circle - K (mm) | Bolt Holes (n × d) | Flange Thickness - C (mm) | Harmonized EN 1092-1 Equivalent |
|---|---|---|---|---|---|---|
| DN 15 | 21.3 | 95 | 65 | 4 × Ø14 | 16 | EN 1092-1 Type 11 (PN40) |
| DN 25 | 33.7 | 115 | 85 | 4 × Ø14 | 18 | EN 1092-1 Type 11 (PN40) |
| DN 50 | 60.3 | 165 | 125 | 4 × Ø18 | 20 | EN 1092-1 Type 11 (PN16/40) |
| DN 80 | 88.9 | 200 | 160 | 8 × Ø18 | 24 | EN 1092-1 Type 11 (PN16/40) |
| DN 100 | 114.3 | 220 | 180 | 8 × Ø18 | 20 (PN16) / 24 (PN40) | EN 1092-1 Type 01 / 11 |
| DN 150 | 168.3 | 285 | 240 | 8 × Ø22 | 22 (PN16) / 28 (PN40) | EN 1092-1 Type 01 / 11 / 05 |
| DN 200 | 219.1 | 340 | 295 | 12 × Ø22 | 24 (PN16) / 30 (PN40) | EN 1092-1 Type 11 (PN16) |
| DN 300 | 323.9 | 460 (PN16) | 410 | 12 × Ø26 | 28 (PN16) / 40 (PN40) | EN 1092-1 Type 11 / 05 |
| DN 500 | 508.0 | 715 (PN16) | 650 | 20 × Ø33 | 44 (PN16) | EN 1092-1 Heavy Forged Series |
| DN 1000+ | Custom Billet | Up to 3000mm | Custom PCD | Tailored Pattern | Up to 180mm | Heavy Machinery / Ring Forging |
International EPC contractors, refinery operators, and industrial stockists face multifaceted risks when sourcing DIN flange products. Beyond basic dimensional accuracy, enterprise buyers require comprehensive quality assurance, material traceability, and commercial reliability.
Counterfeit materials or improper heat treatment can result in catastrophic joint failure under high pressure. Modern enterprise buyers demand 100% heat-number traceability linked directly to chemical ladle analysis and mechanical destructive testing reports (Charpy V-Notch impact test, tensile strength, yield point).
Automatic welding machines and modular skid construction require zero radial deviation. Standard DIN flange face serration (Form C/D or EN 1092-1 Raised Face Type B1/B2) must maintain precise Ra 3.2µm to 12.5µm roughness to prevent spiral gasket leakage.
Procurement teams evaluate vendors on delivered unit cost, container loading efficiency, anti-rust oil application, seaworthy packaging, and landed lead times. Reliable manufacturers prevent costly site downtime caused by damaged bevels or corroded bolt holes.
Located in Dingxiang County, Shanxi—recognized globally as the “Hometown of Forging in China”—Shanxi Yuxin Casting & Forging Co., Ltd. combines three decades of metallurgy expertise with smart industrial automation.
Unlike trading intermediaries, YUXIN controls every step from raw steel billet verification to final export dispatch under one roof. This single-site management model eliminates third-party markups and guarantees absolute quality consistency.
With an annual output exceeding 10,000 metric tons of finished flanges and 2,000 tons of specialized forged components, YUXIN buffers global supply chain volatility for tier-1 EPC contractors.
From extreme subzero arctic pipelines to corrosive chemical reaction towers, YUXIN’s DIN flange size portfolio powers infrastructure across critical industrial sectors.
High-pressure steam headers and sour oil transport systems demand DIN 2635 / DIN 2636 Weld Neck flanges forged from ASTM A182 F11/F22 low-alloy steel or NACE MR0175 compliant carbon steel, designed to withstand hydrogen embrittlement and thermal creep.
Thermal power plants, nuclear cooling loops, and emerging green hydrogen transport grids utilize heavy-duty DIN PN64 and PN100 flanges. Zero leakage design protects against high-velocity steam erosion and gas permeation.
Large-scale municipal water mains and reverse osmosis plants specify high-diameter DIN 2576 Slip-On and DIN 2527 Blind flanges (DN500 to DN2000) coated with epoxy or hot-dip galvanized finishes to resist marine chloride corrosion.
As global processing plants adopt Smart Industry 4.0 architectures and transition toward net-zero decarbonization goals, flange manufacturing is evolving from basic metal forging into intelligent, sustainable structural engineering.
Future DIN flange assemblies are integrating micro-embedded piezoelectric strain sensors and fiber-optic temperature sensors directly into the flange shoulder. This innovation allows real-time monitoring of bolt preload relaxation, joint rotation, and micro-leakage in remote subsea or hydrogen transport pipelines, enabling predictive maintenance before catastrophic failure occurs.
In response to global EU CBAM (Carbon Border Adjustment Mechanism) regulations, YUXIN's technology roadmap focuses on green forging technologies. Utilizing recycled scrap steel, green hydrogen-assisted billet heating furnaces, and lightweight high-entropy alloy compositions, future DIN flanges will deliver 25% higher tensile strength while reducing embodied carbon footprints by up to 40%.
Navigating regional import compliance requires absolute adherence to local technical regulations and robust logistics execution.
Our flanges carry full certification under PED 2014/68/EU and AD 2000-Merkblatt W0 audited by TÜV CERT, allowing seamless import and installation across all European Union member states.
To withstand long sea voyages and humidity changes, flange faces are treated with non-drying anti-rust oil or acrylic lacquer. Bores are protected with plastic caps, and units are packed in ISPM-15 compliant fumigation-free plywood crates.
Our engineering support team offers 24/7 consultation in English, German, Spanish, and Russian, simplifying RFQ reviews, technical drawing verifications, and custom marking requests.
Detailed answers to critical technical questions asked by piping designers, quality auditors, and global buyers regarding DIN flange sizes and standards.
Historical DIN standards (e.g., DIN 2576 for Slip-on, DIN 2633 for Weld Neck PN16) were national German specifications. EN 1092-1 was introduced to harmonize European piping components. Under EN 1092-1, flange types are designated numerically (e.g., Type 01 = Flat Slip-on, Type 11 = Weld Neck, Type 05 = Blind). Pitch circle diameters and bolt hole dimensions remain identical between equivalent DIN and EN standards, allowing direct interchangeability.
For high-pressure/high-temperature conditions, DIN 2634 (PN64), DIN 2635 (PN100), or EN 1092-1 Type 11 (Weld Neck) are recommended. Weld neck flanges transfer bending stresses from the flange ring to the pipe wall via their tapered hub. Material grade selection is critical: use normalized C22.8 / P250GH for moderate temperatures or ASTM A182 F11/F22 chrome-moly steel for temperatures exceeding 450°C.
Historical DIN face forms included Form A (flat face), Form B (raised face), Form C (tongue), Form D (groove), Form E (spigot), and Form F (recess). EN 1092-1 consolidated these into Type A (Flat Face), Type B1/B2 (Raised Face with standard or smooth finish), Type C (Tongue), Type D (Groove), and Type E/F. YUXIN provides precise CNC facing finishes from Ra 3.2µm to 12.5µm per customer specification.
Yes. Beyond standard DIN catalog items, our Shanxi facility specializes in custom engineered forgings, oversized heavy rings (up to 3,000mm outer diameter), non-standard bolt patterns, tube sheets for heat exchangers, and expansion joint flanges. Send your DWG/PDF drawings for immediate feasibility analysis.
Every shipment is accompanied by a comprehensive EN 10204 3.1 Mill Test Certificate (3.2 available upon request with third-party inspection like TÜV, SGS, or Lloyd's Register). Documentation includes chemical heat analysis, mechanical test results (tensile, yield, elongation, impact toughness), heat treatment logs, hardness measurements, and dimensional inspection sheets.
Discover additional precision-machined flanges, tube sheets, lap joint sets, and expansion joints manufactured at our Shanxi forging hub.
Consult directly with Shanxi Yuxin's senior metallurgical engineers. Receive a comprehensive itemized quote, dimensional verification, and manufacturing schedule within 24 hours.
