Our steel and stainless steel exhaust flanges suit a variety of exhaust applications. Made to AWWA C207-13 specifications and ANSI class 150 pattern in both import and domestic.
Exhaust flanges are flat metal connectors used to join sections of an exhaust system. Their main role is to create a tight seal between components, which allows exhaust gases to flow safely and efficiently through the system. They can be used in industrial piping as well as vehicle exhaust setups. These flanges provide a secure mechanical joint that can be disassembled for maintenance or repair.
Made from steel or stainless steel, exhaust flanges are built to handle high temperatures, vibration, and exposure to corrosive elements. Proper flange design and material selection are important to prevent leaks, ensure consistent performance, and maintain system longevity.
Exhaust flanges are typically manufactured in accordance with AWWA C207-13 standards for material and durability requirements. These specifications ensure the flange can withstand elevated temperatures, vibration, and corrosive conditions often found in exhaust systems.
In terms of connection compatibility, many exhaust flanges also follow the ANSI Class 150 bolt pattern, allowing for standardized bolt hole layouts that simplify assembly and interchangeability.
Outside diameters ranging from 3″ to 24″ or more
Bolt hole patterns based on ANSI Class 150 specs
Thicknesses of ½ inch or ⅝ inch are typical for exhaust flanges
Dimensions can vary based on the equipment (e.g., Caterpillar, Cummins, or Mitsubishi engines), and custom options are available for non-standard layouts or materials.
Connecting manifolds, downpipes, and mufflers in cars, trucks, and performance vehicles.
Used in Caterpillar, Cummins, Detroit Diesel, and Mitsubishi engine exhaust assemblies.
Joining exhaust lines in generators and turbines where thermal expansion and maintenance access are priorities.
Managing venting or gas discharge in pumps, compressors, boilers, or HVAC exhausts.
Allowing disassembly and service of exhaust lines in tractors, combines, and other equipment.
Manufactured from steel and stainless steel (304L/316L), these flanges meet AWWA C207-13 specs and handle high temperatures in engine exhaust systems. Commonly used in Caterpillar, Cummins, Detroit, and Mitsubishi engine systems.
Square exhaust flanges are made from materials that meet AWWA C207-13 standards. Their shape allows for secure connections in various exhaust setups, including industrial engines and utility systems.
Designed to accommodate non-standard shapes or bolt patterns. Often used in specialized exhaust assemblies where round or square profiles do not apply. Material selection is based on specific system requirements.
Exhaust flanges are used to join sections of an exhaust system and their primary purpose is to create a tight, secure seal between components. Common in automotive and industrial applications, they make it easy to disassemble or service exhaust systems.
Exhaust flanges typically range from ½ inch to ⅝ inch in thickness for most standard applications.
Yes, gaskets are usually recommended between exhaust flanges to make a tight, leak-free seal. They help compensate for surface imperfections and prevent exhaust gas leaks, which can impact system performance and safety.
To fix a leaking exhaust flange:
Inspect the area to identify cracks, rust, or gasket failure.
Replace the gasket if it’s worn or damaged.
Tighten the bolts evenly to ensure a flush seal.
If the flange itself is warped or corroded, replace the entire flange.
In some cases, a temporary sealant may be used, but proper replacement is the most reliable solution.
You can purchase high-quality exhaust flanges directly from API International. We manufacture and distribute a wide variety of steel and stainless steel flanges, including AWWA C207-13 compliant parts for exhaust applications.
API International is known for:
Fast nationwide shipping from multiple U.S. warehouses
High stock levels of both AIS and imported products
Expert customer service and technical support
Reliable solutions for exhaust, water works, HVAC, and more
Visit our website or contact our team to get the flanges you need.
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.
Customer Reviews
API International, Inc. | All rights reserved. | Terms & Conditions | Privacy Policy
