At API International, we stock PN-rated steel and stainless steel slip-on flanges manufactured to the DIN (Deutsches Institut für Normung) EN 1092-1 European Standard specification. Choose from a wide range of slip-on, ring-style flanges sized according to EN 1092-1 standards available in PN10, PN16, and PN25.
Included are:
Common materials include:
| DIN/EN Pressure Class | Typical Pressure Range* | Common Applications and Service Characteristics |
|---|---|---|
| PN10 | Low pressure (10 bar) | Water distribution, HVAC water loops, irrigation, and utility lines where pressure margins are modest. |
| PN16 | General industrial (16 bar) | Water treatment systems, moderate compressed air, and general plant/process piping where PN10 is insufficient. |
| PN25 | Higher duty (25 bar) | More demanding compressed air service, higher-pressure steam/condensate segments, and chemical/process duties where PN16 is not sufficient. |
| PN40 | High pressure (40 bar) | Higher-pressure process systems and industrial service where thicker flanges and stronger bolting are required. |
| PN63 | Very high pressure (63 bar) | Specialized high-pressure industrial systems with stricter joint robustness requirements. |
| PN100 | Severe pressure (100 bar) | Specialized high-pressure systems requiring tighter engineering controls and careful p/T verification. |
* Note: PN values are nominal pressure designations in bar. Allowable working pressure varies by material group and operating temperature and must be verified against EN 1092-1 pressure/temperature (p/T) tables.
At API International, our DIN flange production is focused primarily on
The ideal solution for systems requiring maximum alignment flexibility or frequent disassembly (EN Type 02 and Type 04). These flanges remain loose on the pipe, allowing for easy rotation during installation, making them the preferred choice for systems subject to repeated maintenance. To ensure a precise fit, the Type 02 flange is used in conjunction with Type 32 or 33 weld-on collars, while the Type 04 is specifically designed to accommodate the neck of a Type 34 weld-on collar.
Engineered to terminate or isolate piping systems during maintenance, pressure testing, or future expansion (EN Type 05). Designed to provide a secure, solid end-closure, these flanges are essential for sealing off flanged connections in high-pressure environments.
Engineered for high-pressure, high-temperature, or cyclic services where optimal stress distribution and fatigue resistance are critical (EN Type 11). Featuring a tapered hub that transitions gradually to the pipe wall thickness, these flanges provide superior reinforcement and are frequently specified for the most demanding industrial process conditions.
Designed for low-pressure piping systems where welding is either impractical or restricted due to site safety constraints (EN Type 13). These flanges feature a threaded bore allowing for a secure mechanical connection without the need for traditional welding. They are the ideal choice for small-diameter lines and environments where volatile risks or space limitations prohibit hot work.
Engineered for low- to moderate-pressure services and share key design characteristics with ANSI/ASME B16.5 standards (EN Type 12). Manufactured from high-quality forged or cut plate raw materials, their integrated hub design simplifies alignment and installation. These flanges provide a versatile and economical alternative to weld-neck varieties across a wide range of industrial piping systems.
EN 1092-1 is the definitive European standard for circular steel pipe flanges. In addition to establishing dimensions and drilling patterns based on DN (Nominal Diameter) and PN (Nominal Pressure), the specification sets rigorous requirements for flange types, facing/sealing surfaces, and tolerances. It further ensures system integrity by mandating strict standards for threading, material composition, and permanent marking for traceability.
While North American industries primarily utilize AWWA, ANSI, and ASME standards, European and international industries rely on DIN (Metric) standards. While DIN flanges are available in familiar styles—including slip-on, weld-neck, and blind—their dimensions and pressure ratings are not interchangeable with ASME or ANSI counterparts. Because outer diameters, bolt patterns, bolt hole diameters, and pressure classes differ, DIN flanges must be paired with piping components that comply with the same metric standards to ensure a secure, leak-free fit.
There is no direct, one-to-one conversion between DIN and ANSI flange standards. Even in instances where bolt patterns may appear to align, critical disparities in pressure-temperature ratings, gasket seating geometries, and machining tolerances remain. While custom-machined adapters can facilitate a connection between European and North American systems, utilizing the correct DIN-standard components is the most efficient and reliable way to ensure system integrity.
DIN flanges are classified by PN (Pressure Nominal) ratings, which indicate the maximum pressure limit in bars at ambient temperature. Common ratings include PN10, PN16, and PN25. For reference, 1 bar is approximately 14.5 PSI; therefore, a PN16 flange is rated for a working pressure of roughly 232 PSI under standard conditions.
Ready to order? API International makes sourcing EN 1092-1 flanges simple. Just let us know your required DN size, PN rating (PN10, PN16, or PN25), preferred material (carbon or stainless steel), and quantities. We specialize in PN-rated plate slip-on flanges and are ready to help you meet your project deadlines. Reach out to our experts for pricing and lead times.
• Custom Bolt Holes, Overbore, Counterbore, Tapped, Welds, O-ring Grooves, Threads, Special Serrations, Bevels, Chamfers
• Metric Parallel, Metric Tapered, Parallel (BSPP), Taper Thread (BSPT), UN/UNF/UNC Thread, NPT (National Pipe Thread)
• MWD
• Contact API’s engineering department for exact specifications and tolerances.
Plastic: Delrin, POM, Lexan, Nylon 66, Nylon 6, PEEK, PP, PE, Acetal
Rubber: EPDM, Neoprene, Buna-N, Viton
Aluminum: A2011, A2024, A2017, A5052, A5056, A6061, A6063, A6463, A6082, A7075
Copper: 3600, 3604, 3771
Titanium: 1-28
Steel Series:
• Ductile Iron: ASTM A536
• Carbon/Mild Steel: A105, A36, A516-70, A572-50, etc.
• Stainless Steel:
- 300 Series – 303, 304, 304L, 316, 316L
- 400 Series – 420J2, 430, 434, 442
Special Metals: Hastelloy, Inconel, Incoloy, Duplex 2205, Super Duplex 2507, Chrome Steel, alloys, or their equivalents
Stock Finish, Spiral Serrated (Phonographic), Concentric Serrated, Smooth Finish, Cold Water Finish, MWD, Phonographic
Dipped, Nickel Plating, Zinc Plating (clear, yellow, black, red, blue), Super Agitine, Powder, Painted, Galvanized, Epoxy, Lacquer
Water/Wastewater, Irrigation, Agriculture, HVAC, Marine, Exhaust, Mining, Energy/Power Generation/Oil
• Forged:
- Ring Rolling:
• Materials: Carbon Steel, Stainless Steel, Duplex
• Size: 2–202”
• Cast:
- Centrifugal Casting (Industrial):
• Material: Stainless Steel
- Continuous Casting:
• Stainless Steel
- Sand Casting:
• Material: A536, Stainless Steel, Ductile Iron
- Investment/Lost-Wax/Precision Casting
• Stainless Steel
Machining: Milling, Turning, Facing, Boring, Drilling, Tapping, Counter Sinking, Laser Cutting, Water Jet, Plasma Cutting
Products | Type | Materials | Size Range |
|---|---|---|---|
Flanges | Flat-Face, Raised-Face, & Plate: Slip-On/Ring Weld, Neck, Blind, Socket Weld, Orifice, Reducing, Threaded | See Materials List | 5–202″ |
Gaskets | Molded, Extruded, sheet | EPDM, Buna-N, NBR, Non-Asbestos (GNA), Red Rubber (GRR), Viton | 5–60″ |
Screens For Filters | Basket Screens and Cone Screens (Perforated, Mesh) | Galv. Carbon Steel, Carbon Steel, Stainless Steel | 6”D x 8’-H |
Rings | Exhaust Rings (Marmon Flanges for DPF Filters) | Carbon Steel, Stainless Steel, Aluminum | 1–16” |
Seamless Rolled Rings | Forged | Carbon Steel, Stainless Steel, Aluminum | 1–165” |
Square Hole Rings | Repair Couplers | Stainless Steel, Carbon Steel, Galvanized, Epoxy Coated | 3–32” |
Fabricated Assemblies | Weldments, Pipe Spools, Valve Bodies, Silencer Housings | Carbon Steel, Stainless Steel | 2–24” |
Long/Short Radius Elbows | EN 10253-2–S235, P235GH–P265GH–P265NL and ASTM A234, WPB, WPC/ A420 WPL6, WPL3/ A860 WPHY52/ ASTM A234 WP11, WP22, WP5, WP9–16Mo3 | 304L & 316L Stainless Steel | (45° & 90°): OD: 21.3mm (1/2”)–3048mm (120”) WT: Up to SCH. XXS/160 |
Miscellaneous | Tubesheets / Diffuser Plates / Baffles / Ferrules / Sleeves / Pins | Carbon Steel, Stainless Steel, Duplex | 5–104” |
Who we are
API International is a manufacturer and wholesale distributor of flanges, expansion joints, valves, other pipe fittings and custom fabricated parts. We offer a wide variety of AIS & imported flanges along with other industrial pipe fitting and accessories. Customers turn to us when they need quick delivery of parts and are looking for a higher level of customer service. Standard parts are stocked in one of our conveniently located warehouses for quick distribution throughout the United States.
