Custom Flanges

Our company provides Custom Flanges.

We are a professional flange manufacturer and can provide you with customized flanges with various requirements. No matter how many you have, even one flange can be customized for you. Welcome to consult our engineers.

lewis Liu

sales Manager

Custom Flanges

custom flanges are specialized flange components that are designed and manufactured to meet specific requirements and specifications that may not be covered by standard flange types. Here are some key features and considerations for custom flanges:

Customization OptionsCustom flanges can be tailored to meet unique requirements, including non-standard sizes, shapes, facing types, and pressure ratings.
Material SelectionThe choice of materials for custom flanges can vary widely, depending on the application’s specific needs. Common materials include carbon steel, stainless steel, alloy steel, and exotic alloys.
Facing TypesCustom flanges can be designed with various facing types, such as Raised Face (RF), Flat Face (FF), Ring-Type Joint (RTJ), and Male and Female (M&F) facings, depending on sealing requirements.
Bolt Hole Quantity and DiameterThe number and diameter of bolt holes can be customized to fit the intended connection method and pressure rating.
Connection MethodCustom flanges can be designed for different connection methods, including welding, threading, socket welding, and bolting, based on the application’s needs.
Application SpecificsCustom flanges are typically engineered to meet the specific demands of the application, whether it involves extreme temperatures, high pressures, corrosive environments, or unique geometries.
Engineering ExpertiseDesign and manufacturing of custom flanges require specialized engineering expertise and may involve finite element analysis (FEA) to ensure structural integrity.
Compliance with StandardsCustom flanges should adhere to relevant industry standards, such as ASME, ANSI, API, or specific industry codes and regulations, as applicable.
Inspection and TestingCustom flanges should undergo rigorous inspection and testing procedures to ensure they meet quality, performance, and safety standards.
CertificationDepending on the application, custom flanges may require certifications such as PED (Pressure Equipment Directive) or ASME certification.
Special CoatingsCustom flanges may require specialized coatings or treatments to enhance corrosion resistance, wear resistance, or other properties.
Application AreasCustom flanges find application in industries where standard flanges cannot meet unique project requirements, including oil and gas, chemical processing, aerospace, and more.
CompatibilityCustom flanges must be designed to work seamlessly with other system components, including pipes, valves, and equipment.
Lead TimesManufacturing custom flanges may have longer lead times compared to off-the-shelf standard flanges due to the engineering and customization involved.
custom flanges

Custom flanges are valuable solutions for industries and projects that demand precision, reliability, and performance tailored to specific needs. Engineers and manufacturers collaborate to design and produce custom flanges that meet the most challenging application requirements.

Customized flange refers to flange products that are made according to the specific requirements of customers. Customization of flanges typically includes the following aspects:

  1. Size customization: Flanges can be customized according to the specific requirements of customers, including the diameter, bore size, and bolt-hole arrangement of the flange.
  2. Material customization: Flanges can be customized based on the application and requirements of customers. Common materials for customization include carbon steel, stainless steel, alloy steel, and cast iron.
  3. Pressure rating customization: Flanges can be customized to meet the specific pressure requirements of customers. Common pressure ratings for customization include PN6, PN10, PN16, PN25, etc.
  4. Connection method customization: Flanges can be customized to fit the specific connection requirements of customers, including threaded connection, welding connection, and flanged connection.
  5. Surface treatment customization: Flanges can be customized with specific surface treatments to meet customers’ anti-corrosion requirements. Surface treatments can include painting, galvanizing, organic coatings, rubber coatings, etc.

Customized flanges are able to meet the specific needs of customers and provide more precise and suitable solutions. Customers can discuss their requirements with flange manufacturers and develop customized flange products that best meet their needs.


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.

These flange types include:

Slip-on Flanges – available in both standard and reduced sizes and both ring and hub styles, manufactured to dimensions that will slide over a pipe with a snug fit

Weld Neck Flanges – available in standard and reduced sizes, manufactured to the inside diameter dimensions of a pipe for attachment via welding

Blind Flanges – available to seal both pipes and vessels

Lap Joint Flanges – available in a range of sizes to pair with stub end fittings for easy dismantling

Threaded Flanges – engineered to fit pipes with external threads for weld-free fits

Socket-weld Flanges – designed with a socket fit and top weld for ideal inner flow in pipe systems


Customized flanges are widely used in many different industries and sectors. Here are some common industries where customized flanges find applications:

  1. Oil and gas industry: Customized flanges are commonly used in pipeline systems, valve connections, and equipment installations involved in oil and gas exploration, extraction, transportation, and processing.
  2. Chemical industry: Fluid handling systems, reactors, storage tanks, and other equipment in the chemical industry often require customized flanges to ensure proper sealing and safety.
  3. Power industry: Power plants and power transmission systems require customized flanges for connecting pipelines, fans, gas turbines, and steam boilers.
  4. Water treatment industry: Water treatment equipment, pumps, pipelines, and storage tanks require customized flanges for connections and sealing.
  5. Pharmaceutical industry: In pharmaceutical equipment and production systems, customized flanges are used for connecting pipelines, reactors, dryers, and other equipment.
  6. Food and beverage industry: Customized flanges are used in equipment such as pipelines, storage tanks, and filters for food and beverage processing.
  7. Construction and building materials industry: HVAC systems, kitchen equipment, and water heaters in construction projects require customized flanges for connecting pipelines and equipment.

Additionally, customized flanges are also used in shipbuilding, pulp and paper industry, metallurgical industry, medical equipment, and many other industries and sectors. Since each industry and application requires different flange specifications and characteristics, customized flanges can meet various specific needs.

The process of customizing flanges typically involves the following steps:

  1. Requirement analysis: The first step is to understand the specific requirements of the customer. This includes determining the size, material, pressure rating, connection method, and surface treatment needed for the custom flange.
  2. Design and engineering: Once the requirements are known, the flange manufacturer will work on the design and engineering of the custom flange. This includes creating detailed technical drawings and calculations to ensure the flange meets the required specifications.
  3. Material selection and procurement: Based on the design requirements, the appropriate material for the custom flange is chosen. The manufacturer may procure the material from suppliers or use materials provided by the customer.
  4. Manufacturing: Once the design and material are finalized, the manufacturing of the custom flange begins. This involves various processes such as cutting, shaping, drilling, and machining to create the desired shape and features of the flange.
  5. Surface treatment: After manufacturing, if required, the custom flange undergoes surface treatment such as painting, galvanizing, or other protective coatings according to the customer’s specifications.
  6. Quality control: Throughout the manufacturing process, strict quality control measures are implemented to ensure the flange meets the specified standards and requirements. This includes dimensional inspections, material testing, and pressure testing.
  7. Delivery and installation: Once the custom flange is manufactured and passes all quality checks, it is packaged securely and delivered to the customer. The customer can then install the flange according to their specific application requirements.

It is important to note that the exact process may vary depending on the specific requirements and capabilities of the flange manufacturer. Close collaboration and effective communication between the customer and the manufacturer are essential to ensure the successful customization of flanges.

YANHAO is first and foremost a job shop for custom flanges. Although we do supply industry-standard flanges, a healthy portion of our work consists of modified or custom flanges for special applications. All custom flanges at YANHAO endure the same quality inspection that standard flanges receive. Our experience manufacturing custom flanges allows YANHAO to react quickly without fear of the unknown. Due to the large raw material inventory that YANHAO stocks, most custom flanges are able to be turned around within a few days.

Not sure what you need? We can provide you with custom flange templates that you can alter so that we can gain knowledge of your application and particular need. We work closely with our clients to ensure a full understanding of expectations for the final product. You are given the opportunity of a final review of the product before it is manufactured, guaranteeing full satisfaction.

As an experienced custom flange manufacturer, YANHAO understands the needs of our clients and strives to deliver the best products on the market today. We make it simple to design and produce custom products intended to best serve any need.

To order a flange, first determine your specific requirements such as size, pressure rating, and material. Then, find a reputable supplier and contact them with your requirements. Request a quotation and compare the offers from different suppliers. Once you’ve chosen a supplier, place the order, make the payment, and coordinate the delivery. Maintain clear communication throughout the process to address any questions or adjustments.

Certainly, we have a professional design team that can provide AutoCAD drawings based on your requirements.

The cost of customized flanges can vary depending on various factors such as the complexity of the design, materials used, size, and quantity required. Generally, customized flanges may be more expensive than standard off-the-shelf flanges due to the additional engineering, design, and manufacturing processes involved. However, the cost can be justified by the benefits of a precise fit, specific requirements, and enhanced performance. It is advisable to consult with suppliers or manufacturers directly to get accurate pricing information based on your specific customization needs.

Measure across the centre from one side of the internal hole to the opposite side of the hole. Measure across the centre from the external edge to the other external edge of the flange. Measure from the centre of the bolt hole to the centre of the opposite bolt hole.

The advantages of customized flanges lie in their ability to be designed and manufactured based on specific customer requirements to fit specific application scenarios. This ensures a precise match with other equipment and pipelines, resulting in improved performance and reliability. Additionally, customized flanges offer diverse options in specifications and sizes, high quality and reliability, excellent sealing performance, and enhanced safety, catering to the specific needs of different industries and projects.

The delivery time for customized flanges may vary depending on the specifications, models, and quantities required. We, as a supplier, understand the importance of meeting our customers’ needs and providing accurate delivery estimates. Therefore, we make it a priority to assess each customer’s individual situation and provide them with a specific and reliable delivery time. Rest assured that we are committed to delivering the products on time according to the agreed-upon schedule.