We stock PN-rated steel and stainless steel slip-on flanges made to DIN specifications, available in ring and slip-on styles in PN10, PN16, and PN25.
Deutsches Institut für Normung (DIN), or the German Institute for Standardization, is the official body that designates industrial and non-industrial standards for Germany. DIN is also the national standards body that determines the German edition of European and International Organization for Standardization (ISO) standards. Compatible parts and components are imperative to proper function and safety, and relying on a set of standards like DIN ensures consistency between manufacturers and suppliers.
DIN sets industry standards for quality assurance and safety, including flange materials requirements and pressure and temperature rating. While DIN flanges are less common in the United States, imported systems and equipment or international maritime vessels may require these metric pipe flanges and parts. Because compatible piping system components are important for proper function, flange distributors like API International, Inc. often stock flanges manufactured to Deutsches Institut für Normung specifications.
DIN flanges are available in standardized pressure classes such as PN10, PN16, and PN25. Each class is designed to meet specific operating pressure requirements and dimensional specifications defined by the Deutsches Institut für Normung (DIN).
DIN-PN 10 flanges are designed for low-pressure systems up to 10 bar and are commonly used in water, HVAC, and general utility applications.
DIN-PN 16 flanges handle pressures up to 16 bar and are widely used in industrial systems like water treatment, chemical lines, and compressed air.
DIN-PN 25 flanges are built for higher-pressure systems up to 25 bar and are suited for demanding applications such as heavy-duty industrial processes.
Made to DIN EN 1092-1:2007 standards, carbon steel flanges offer reliable strength and are ideal for general industrial and mechanical applications.
Manufactured from corrosion-resistant 304L or 316L stainless steel, these flanges are suited for demanding environments requiring hygiene or chemical resistance.
A DIN flange is a pipe flange manufactured to standards set by the German Institute for Standardization (DIN) for use in metric-based piping systems.
While America’s most common standards for flanges and fittings are AWWA, ANSI, and ASME, European and international industries rely on DIN standards, which use the metric system. DIN flanges are available in the same flange styles as ASME/ANSI flanges, such as slip-on, weld-neck, and blind flanges. Similar measurements are taken to determine the appropriate flange size—including outer and inner diameter, the number of bolt holes, and bolt hole and bolt circle diameter. However, for DIN flanges these dimensions and the pressure ratings are different than those on an AWWA, ANSI or ASME flange. For this reason, DIN flanges should be paired with piping system components that comply with the same standard.
DIN flanges are not interchangeable with ANSI- or ASME-rated flanges or piping systems because mismatched flanges cannot be mated. There is no exact DIN-to-ANSI flange conversion—even if the bolt holes align, there may be a disparity between pressure ratings or other aspects of the standards. While adapters can be custom machined to facilitate matching European standard and American standard piping components, using the appropriate DIN components is a quicker, easier option.
DIN flanges are rated by PN (Pressure Nominal), with common ratings including PN10, PN16, and PN25, which represent pressure limits in bars.
Determine the required materials, pressure requirements, and appropriate flange size. If your piping system requires metric flanges, the dimensions and pressure rating differ from non-DIN flanges. Always refer to the standards for the intended application to ensure the flanges are manufactured to the correct dimensions and tolerances.
Capabilities:
• Custom Bolt Holes, Overbore, Counterbore, Tapped, Welds, O-ring Grooves, Threads, Special Serrations, Bevels, Chamfers
Thread Style:
• Metric Parallel, Metric Tapered, Parallel (BSPP), Taper Thread (BSPT), UN/UNF/UNC Thread,
NPT (National Pipe Thread)
Serrations:
• MWD
Tolerances:
• 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
Forming:
• Forged:
- Ring Rolling:
• Materials: Carbon Steel, Stainless Steel, Duplex
• Size: 2–202”
• Cast:
- Centrifugal Casting (Industrial):
• Material: Stainless Steel
- Continuous Casting:
• Material: Stainless Steel
- Sand Casting:
• Material: A536, Stainless Steel, Ductile Iron
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 | Carbon Steel, Stainless 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.
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