Tailored Solutions For Industrial Piping
We have experience helping engineers, estimators, purchasing agents and more with their custom flanges.
Tailored Solutions For Industrial Piping
We have experience helping engineers, estimators, purchasing agents and more with their custom flanges.
Custom Flanges are tailored steel flanges designed to meet specific industrial requirements, adhering to ASME B16.5 and other standards as of August 23, 2025, 06:54 PM PDT. These Tailored Piping Flanges offer precision fit.
Available in custom sizes from 1/2” to 60” and pressure ratings up to Class 2500, Custom Flanges accommodate temperatures up to 700°C, depending on material, for unique applications.
Fabricated through advanced forging or machining, these flanges provide exact specifications, with coatings like 3LPE or galvanizing enhancing corrosion resistance as of August 2025. Customization is key.
Compared to standard flanges, Custom Flanges offer unmatched adaptability, with a service life of 15–40 years based on design and maintenance practices.
Custom Flanges address specific challenges like unique pipe layouts and extreme conditions, delivering reliable industrial piping customization as of August 23, 2025.
We also provide custom flange templates for you to modify to your liking to get a better understanding of your application. Additionally, drawings for approval can be requested prior to actual manufacturing, provided an order already stands. This gives you an opportunity to have one final review of your incoming product before we throw your forging onto the machines.
Anyone can provide standard commodity B16.5 flanges, but not everyone can make them in small quantities with a quick turn-around when something needs to be modified past typical industry requirements.
Although we do not directly design custom flanges, we do provide custom flanges to your requirements. We do not always have a standard for reference if your job isn’t to ASME code, and so we have to confirm all the dimensions with you. When you order a custom flange, please show all the details or requirements to our sales staff to ensure our quotation will be accurate.
Special flanges and fittings and custom forgings can be designed to meet any number of unique specifications and standards. Some common classifications for custom pipe flanges include:
Large custom industrial Flange
With a wide range of industries, shops, and systems dependent upon high performance flanges, custom pipe flanges are often essential to getting a job done right.
Modified and custom flanges for specialty projects can offer the same quality, inspection requirements, and performance expectations of industry standard components, but offer a particular size, material, or fit for a unique application.
Regardless of custom sizing or specifications, the fundamental design of most flanges falls under six common styles created to close, connect, cover, or support pipes and pipe systems.
The most common type, featuring a raised sealing surface that concentrates the bolting force on a smaller area.
Has a flat sealing surface, commonly used with cast iron flanges and for low-pressure applications.
Features a groove for metal ring gaskets (oval or octagonal), providing metal-to-metal sealing.
Features matching tongue and groove surfaces, providing self-alignment and confined gasket area.
Flange faces have to be smooth enough to ensure a tight, leak-free seal for bolted flanges.
| Flange Face Type | Flange Face Type | Flange Face Type |
|---|---|---|
| Type A: flat face | Type D: groove face | Type G: O Ring recess |
| Type B: raised face | Type E: spigot | Type H: O Ring groove |
| Type C: tongue face | Type F: recess |
| ASME B16.5 | Pipe Flanges NPS 1/2 - 24 |
| ASTM A105 | Forged Carbon Steel |
| ASTM A350 LF2 | Low-Temperature Service |
| ASTM A182 | High-Temperature Service |
| ASTM A694 | High-Pressure Transmission |
| DIN EN 1092-1 | European Standard PN 2.5-400 |
Most commonly used, forged with machined surfaces
Corrosion resistant, grades 304, 316, etc.
High-temperature and high-pressure applications
Cast iron, aluminum, brass, bronze, plastic
| Material Category | Fittings (ASTM Grade) | Flanges (ASTM Grade) | Valves (ASTM Grade) | Bolts & Nuts (ASTM Grade) |
|---|---|---|---|---|
| Carbon Steel | A234 Gr WPA | A105 | A216 Gr WCB | A193 Gr B7 A194 Gr 2H |
| A234 Gr WPB | A105 | A216 Gr WCB | ||
| A234 Gr WPC | A105 | A216 Gr WCB | ||
| Carbon Steel
Alloy (High-Temperature) |
A234 Gr WP1 | A182 Gr F1 | A217 Gr WC1 | A193 Gr B7 A194 Gr 2H |
| A234 Gr WP11 | A182 Gr F11 | A217 Gr WC6 | ||
| A234 Gr WP12 | A182 Gr F12 | A217 Gr WC6 | ||
| A234 Gr WP22 | A182 Gr F22 | A217 Gr WC9 | ||
| A234 Gr WP5 | A182 Gr F5 | A217 Gr C5 | ||
| A234 Gr WP9 | A182 Gr F9 | A217 Gr C12 | ||
| Carbon Steel
Alloy (Low-Temperature) |
A420 Gr WPL6 | A350 Gr LF2 | A352 Gr LCB | A320 Gr L7 A194 Gr 7 |
| A420 Gr WPL3 | A350 Gr LF3 | A352 Gr LC3 | ||
| Austenitic Stainless Steel | A403 Gr WP304 | A182 Gr F304 | A182 Gr F304 | A193 Gr B8 A194 Gr 8 |
| A403 Gr WP316 | A182 Gr F316 | A182 Gr F316 | ||
| A403 Gr WP321 | A182 Gr F321 | A182 Gr F321 | ||
| A403 Gr WP347 | A182 Gr F347 | A182 Gr F347 |
ASTM standards define the specific manufacturing process of the material and determine the exact chemical composition of pipes, fittings and flanges, through percentages of the permitted quantities of carbon, magnesium, nickel, etc., and are indicated by "Grade".
The usual materials of flanges include stainless steel, carbon steel, aluminum and plastic. The choice of the material largely depends on the purpose of the flange. For example, stainless steel is more durable and is necessary for heavy use. On the other hand, plastic is more feasible for use in the home because of its reasonable price and easy installation. The materials used for flanges are under the designation of the American Society of Mechanical Engineers.
The most common materials for pipe flanges (forged grades) are: ASTM A105 (carbon steel high temperature to match A53/A106/API 5L pipes), A350 Grades LF1/2/3 (carbon steel low temperature to match A333 pipes), A694 Grades F42 to F80 (high yield carbon steel to match API 5L pipe grades), ASTM A182 Grades F5 to F91 (alloy steel flanges to match A335 pipes), A182 Grade F304/316 (stainless steel flanges to match A312 SS pipes), A182 Gr. F44/F51/F53/F55 (duplex and super duplex to match A790/A928 pipes) and various nickel alloy grades (Inconel, Incoloy, Hastelloy, Monel).
The material qualities for these flanges are defined in the ASTM standards.
Metal flanges are classified from 150 to 2500 # rating for different pressure applications.
Incoloy 825 Flange
Industries Using
The basic application of the Custom Flange to connect pumps, pipes, valves, and other equipment, often using butt welds, to make a pipework system.
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