At YANHAO, we take immense pride in offering a wide range of industrial solutions, and our Class 400 flanges are no exception. These products are designed to meet the highest industry standards, providing unmatched performance and durability. In this detailed product page, we delve into the world of Class 400 flanges, offering in-depth insights and expertise.

What Are Class 400 Flanges?

Class 400 flanges are a specific type of flange used in piping systems and industrial applications. They are designed to meet certain pressure and temperature ratings, making them suitable for high-pressure environments. Here’s a more detailed explanation of what Class 400 flanges are:

1. Pressure Rating: Class 400 flanges are designed to withstand high levels of pressure. The “Class” designation represents the flange’s pressure rating in pounds per square inch (PSI). In this case, Class 400 flanges are typically rated for pressures of 400 PSI, which is significantly higher than standard flanges used in lower-pressure applications.

2. Size and Dimensions: These flanges come in various sizes and dimensions to accommodate different pipe sizes and connection requirements. The specific dimensions and drilling patterns (bolt hole sizes and spacing) of Class 400 flanges adhere to industry standards and are designed to ensure a secure and leak-free connection.

3. Materials: Class 400 flanges can be manufactured from various materials, such as carbon steel, stainless steel, or other alloys, depending on the application’s requirements. The choice of material is essential to ensure the flange’s resistance to corrosion, temperature, and pressure conditions.

4. Applications: Class 400 flanges are commonly used in industries and applications where high-pressure systems are involved. Some typical applications include:

  • Oil and Gas: Class 400 flanges are used in pipelines for the transportation of oil and natural gas, where high pressures are common.
  • Chemical Processing: Chemical plants often use Class 400 flanges to connect piping in processes that involve corrosive substances and high pressures.
  • Power Generation: In power generation facilities, such as power plants and refineries, Class 400 flanges are employed to ensure the integrity of steam and water piping systems.
  • Petrochemical Industry: These flanges are crucial for connecting pipes in petrochemical plants, where high-pressure and high-temperature conditions are prevalent.
  • Water Treatment: In water treatment plants, Class 400 flanges are used for piping systems that handle high-pressure water flows.

5. Safety and Reliability: Due to their high-pressure rating, Class 400 flanges are chosen for applications where safety and reliability are of utmost importance. These flanges are engineered to prevent leaks and maintain the integrity of the piping system, reducing the risk of accidents and costly downtime.

In summary, Class 400 flanges are specialized pipe connectors designed to handle extreme pressure conditions. They play a critical role in industries where maintaining the integrity of high-pressure systems is essential for safety and operational efficiency. The choice of Class 400 flanges ensures a reliable and leak-free connection in demanding applications.

Key Features of Class 400 Flanges:

  1. High Pressure Resistance: Class 400 flanges are engineered to withstand extreme pressures, making them suitable for applications where maintaining the integrity of the piping system under high pressure is crucial.
  2. Materials: These flanges are available in a variety of materials, including carbon steel, stainless steel, and specialty alloys. The choice of material depends on the specific requirements of the application, such as resistance to corrosion or high-temperature environments.
  3. Precision Engineering: Class 400 flanges are precision-engineered to meet industry standards for dimensions and bolt hole patterns. This ensures a perfect fit and alignment when connecting pipes and components, reducing the risk of leaks and system failures.
  4. Corrosion Resistance: Many Class 400 flanges are designed with corrosion-resistant coatings or materials to prolong their lifespan, especially in environments where exposure to corrosive substances is a concern.
  5. Versatile Applications: These flanges find applications across a wide range of industries, from oil and gas to chemical processing, power generation, petrochemical, and water treatment. Their versatility makes them a valuable component in various systems.
  6. Customization: Class 400 flanges can be customized to meet specific project requirements, including size, material, and special coatings. This customization ensures that they are tailored to the needs of the application.
  7. Leak Prevention: The design of Class 400 flanges, with their precise dimensions and tight sealing capabilities, helps prevent leaks in high-pressure systems. This is essential for maintaining safety and preventing costly downtime.
  8. Durability: These flanges are known for their durability and long service life, making them a cost-effective choice for industries where reliability and longevity are paramount.
  9. Compliance with Standards: Class 400 flanges typically adhere to industry standards and certifications, ensuring that they meet the necessary safety and performance criteria.
  10. Ease of Installation: With their standardized dimensions and bolt hole patterns, Class 400 flanges are relatively easy to install, reducing installation time and labor costs.
  11. Pressure Testing: They are often subjected to rigorous pressure testing during manufacturing to ensure they can handle the rated pressure safely.
  12. Maintenance Benefits: The reliability of Class 400 flanges translates into reduced maintenance costs, as they are less likely to require frequent repairs or replacements.

These key features collectively make Class 400 flanges a preferred choice in industries where high-pressure applications demand reliable and robust pipe connections. Their versatility, durability, and adherence to standards contribute to their widespread use across various sectors.

Benefits of YANHAO Class 400 Flanges

The benefits of YANHAO Class 400 Flanges are numerous, making them a valuable choice for high-pressure piping and industrial applications. Here are some of the key advantages of using YANHAO Class 400 Flanges:

  1. Reliability: YANHAO Class 400 Flanges are engineered for high-pressure environments, providing reliable and leak-free connections. This reliability ensures the integrity of your piping systems, reducing the risk of accidents and system failures.
  2. Safety: The ability of these flanges to withstand high pressures contributes to a safer work environment. They help prevent leaks and blowouts, which can be dangerous in industries where safety is a top priority.
  3. Cost Efficiency: YANHAO Class 400 Flanges offer long-term cost savings. Their durability means they require less frequent maintenance or replacement, reducing downtime and maintenance expenses.
  4. Versatility: These flanges are versatile and can be customized to meet specific project requirements. YANHAO can provide Class 400 Flanges in various sizes, materials, and configurations, ensuring they are suitable for a wide range of applications.
  5. Corrosion Resistance: YANHAO understands the importance of corrosion resistance. Class 400 Flanges are designed to resist corrosion, even in harsh environments. This extends their lifespan and ensures consistent performance.
  6. Expertise: YANHAO brings decades of expertise to the design and manufacturing of Class 400 Flanges. Their team of experts understands the unique requirements of high-pressure applications, ensuring the products meet or exceed industry standards.
  7. Authoritativeness: YANHAO is recognized as an authority in the industry. Their commitment to quality and adherence to industry standards establishes them as a trusted supplier of Class 400 Flanges.
  8. Trustworthiness: YANHAO’s track record for delivering dependable products and exceptional customer service instills trust among customers. Their Class 400 Flanges consistently meet the highest standards of quality and performance.
  9. Custom Solutions: YANHAO offers custom solutions to meet the specific needs of your project. Whether you require non-standard sizes, materials, or configurations, their expertise allows for tailored solutions.
  10. Customer Testimonials: YANHAO’s satisfied customers provide real-world feedback and testimonials, showcasing the success and reliability of their Class 400 Flanges in various industries and applications.

In summary, YANHAO Class 400 Flanges offer a range of benefits, including reliability, safety, cost efficiency, versatility, corrosion resistance, and the backing of an expert and trustworthy supplier. These advantages make YANHAO Class 400 Flanges a preferred choice for industries where high-pressure systems demand dependable and long-lasting pipe connections.


Class 400 flanges find extensive applications across a range of industries and environments where high-pressure piping systems are required. Their ability to handle extreme pressures and provide reliable connections makes them essential components in various critical applications. Here are some common applications of Class 400 flanges:

Oil and Gas Industry:

  • Class 400 flanges are commonly used in oil and gas pipelines to withstand the high pressures associated with the transportation of crude oil and natural gas.
  • They are utilized in offshore drilling platforms where high-pressure piping systems are crucial for extraction and processing operations.

Chemical Processing:

  • Chemical plants often rely on Class 400 flanges for connecting pipelines that carry corrosive chemicals at elevated pressures.
  • These flanges help maintain the integrity of the systems and ensure the safe handling of hazardous materials.

Power Generation:

  • Power plants, including thermal and nuclear facilities, utilize Class 400 flanges in critical systems where high-pressure steam, water, or other fluids are involved.
  • These flanges are integral to the safe and efficient operation of power generation equipment.

Petrochemical Industry:

  • Petrochemical refineries depend on Class 400 flanges to connect pipelines carrying various petrochemical products under high pressures and temperatures.
  • Flanges play a vital role in preventing leaks and ensuring the reliability of processes.

Water Treatment:

  • Municipal water treatment plants use Class 400 flanges in systems that require high-pressure water flows for purification and distribution.
  • Flanges help maintain consistent water quality and distribution.

Manufacturing and Industrial Processes:

  • Class 400 flanges are utilized in manufacturing industries, such as steel production and paper mills, where high-pressure steam and fluids are essential for operations.
  • These flanges help optimize manufacturing processes and minimize downtime.

Aerospace and Defense:

  • The aerospace and defense sectors use Class 400 flanges in hydraulic and pneumatic systems, where high-pressure fluids or gases are employed.
  • The reliability of flange connections is critical for mission-critical applications.

Marine and Shipbuilding:

  • In shipbuilding and maritime applications, Class 400 flanges are used in various high-pressure systems, including those for propulsion, hydraulics, and cargo handling.

Mining Industry:

  • Mines often require high-pressure systems for transporting water, slurry, and chemicals. Class 400 flanges ensure the robustness and integrity of these systems.

Food and Beverage Processing:

  • Class 400 flanges may be used in food and beverage processing plants where high-pressure steam or fluids are needed for sterilization, cooking, or cleaning processes.

Pharmaceutical Industry:

  • Pharmaceutical manufacturing facilities utilize Class 400 flanges for high-pressure applications, ensuring the integrity and sterility of critical processes.

Construction and Infrastructure:

  • In large-scale construction projects, such as bridges and tunnels, Class 400 flanges are employed in hydraulic systems and high-pressure water applications.

These are just some of the many applications where Class 400 flanges play a pivotal role in maintaining the integrity and safety of high-pressure piping systems. Their versatility, reliability, and ability to meet stringent industry standards make them indispensable components in various industrial sectors.

Quality Assurance

YANHAO’s commitment to quality assurance is a fundamental aspect of our Class 400 flange production process. We understand the critical importance of delivering flanges that meet or exceed industry standards, ensuring the safety and reliability of high-pressure piping systems. Here’s an overview of our quality assurance practices:

1. Material Selection:

  • We start with the careful selection of high-quality materials, considering factors such as strength, corrosion resistance, and suitability for the intended application.
  • Materials are sourced from reputable suppliers who adhere to strict quality control standards.

2. Precision Manufacturing:

  • Our manufacturing process adheres to stringent engineering and design specifications.
  • Class 400 flanges are precision-machined to ensure accurate dimensions and tight tolerances, critical for proper fit and sealing.

3. Compliance with Standards:

  • YANHAO’s Class 400 flanges are designed and manufactured to meet or exceed industry standards and regulations, such as ASME, ANSI, ASTM, and API standards.
  • We maintain certifications and documentation to verify compliance.

4. Rigorous Testing:

  • Each Class 400 flange undergoes comprehensive testing to verify its performance under high-pressure conditions.
  • Hydrostatic and pneumatic tests are conducted to ensure that the flanges can safely withstand the rated pressure.

5. Non-Destructive Testing (NDT):

  • Non-destructive testing methods, such as ultrasonic testing and magnetic particle inspection, are employed to detect any surface or subsurface defects that could compromise the integrity of the flanges.

6. Quality Control Inspections:

  • Our experienced quality control team conducts thorough inspections at various stages of production to identify and address any issues.
  • This includes dimensional inspections, visual inspections, and material verification.

7. Traceability:

  • YANHAO maintains strict traceability records, allowing us to track the materials and manufacturing processes used for each Class 400 flange.
  • This traceability ensures accountability and facilitates product recall if necessary.

8. Documentation and Certifications:

  • YANHAO provides comprehensive documentation, including material certificates, test reports, and compliance certificates, with each product.
  • Our certifications demonstrate our commitment to quality and compliance.

9. Continuous Improvement:

  • We continually review and improve our manufacturing processes to enhance product quality and efficiency.
  • Customer feedback and internal audits drive our continuous improvement initiatives.

10. Customer Satisfaction:
– YANHAO places a strong emphasis on customer satisfaction. We actively seek feedback from customers and work to address any concerns promptly.
– Our commitment to delivering reliable and high-quality Class 400 flanges is reflected in our long-term customer relationships.

YANHAO’s quality assurance practices ensure that our Class 400 flanges not only meet the demands of high-pressure applications but also provide peace of mind to our customers, knowing that they are investing in products of the highest quality, safety, and reliability.

Why Choose YANHAO for Class 400 Flanges?

Choosing YANHAO for Class 400 Flanges is a decision based on several compelling reasons that set us apart as a trusted and reputable supplier in the industry. Here are key factors that make YANHAO the preferred choice for Class 400 Flanges:

  1. Expertise: YANHAO boasts decades of experience in the design, manufacturing, and application of Class 400 Flanges. Our team of experts possesses in-depth knowledge of high-pressure systems, ensuring that our products meet the most stringent requirements.
  2. Quality Assurance: We prioritize quality above all else. YANHAO’s commitment to quality assurance is evident in our adherence to industry standards, rigorous testing, and precision manufacturing processes, all aimed at delivering products of exceptional quality and reliability.
  3. Compliance with Standards: Our Class 400 Flanges are designed and manufactured to comply with industry standards and regulations, such as ASME, ANSI, ASTM, and API standards. This ensures that our products consistently meet the highest performance and safety criteria.
  4. Custom Solutions: YANHAO recognizes that every project is unique. We offer customization options for Class 400 Flanges, allowing you to tailor the product to your specific requirements in terms of size, material, and coatings.
  5. Materials Selection: We carefully select high-quality materials that are suitable for your application, considering factors like strength, corrosion resistance, and environmental conditions. Our materials are sourced from reputable suppliers who meet stringent quality control standards.
  6. Rigorous Testing: YANHAO conducts comprehensive testing on each Class 400 Flange to ensure its performance under high-pressure conditions. Our hydrostatic and pneumatic tests verify the flanges’ ability to safely withstand rated pressure.
  7. Non-Destructive Testing (NDT): We employ non-destructive testing methods, such as ultrasonic testing and magnetic particle inspection, to identify any surface or subsurface defects that could compromise the integrity of the flanges.
  8. Traceability: Our strict traceability records allow us to track the materials and manufacturing processes used for each Class 400 Flange. This ensures accountability and facilitates product recall if necessary.
  9. Customer Satisfaction: YANHAO places a strong emphasis on customer satisfaction. We actively seek feedback from our customers and work to address any concerns promptly. Our long-term customer relationships are a testament to our dedication to meeting customer needs.
  10. Reputation and Trustworthiness: YANHAO has established itself as a reputable and trustworthy supplier in the industry. Our track record for delivering dependable products and exceptional customer service instills confidence in our customers.
  11. Global Reach: We have a global presence and can serve customers worldwide. Our distribution network ensures timely delivery of Class 400 Flanges to your location, regardless of where your project is located.

In conclusion, choosing YANHAO for Class 400 Flanges means gaining access to expertise, quality assurance, compliance with industry standards, customization options, and a commitment to customer satisfaction. Our reputation for delivering reliable, high-quality products makes us the go-to choice for industries where high-pressure systems demand dependable and long-lasting pipe connections.


Here is a consolidated list of common questions and their corresponding answers regarding YANHAO’s Class 400 Flanges:

1. What are Class 400 Flanges?

  • Class 400 Flanges are a type of flange connector designed for high-pressure piping systems. They are engineered to withstand extremely high pressures and are typically used in applications where maintaining the integrity of high-pressure piping systems is essential.

2. What size and material options are available for YANHAO’s Class 400 Flanges?

  • YANHAO offers a variety of size and material options for Class 400 Flanges to accommodate a wide range of project requirements. We can provide customized solutions based on specific needs, including size, material, and coating selections.

3. What are the key features of Class 400 Flanges?

  • The key features of Class 400 Flanges include high-pressure resistance, superior materials, precision engineering, corrosion resistance, versatility in applications, and customization options. They are suitable for various high-pressure environments, ensuring secure pipeline connections.

4. How does YANHAO ensure quality assurance for its Class 400 Flanges?

  • YANHAO is committed to providing high-quality products. We follow a strict quality assurance process, including material selection, precision manufacturing, rigorous testing, and compliance with industry standards, to ensure that each Class 400 Flange meets high-performance and safety standards.

5. How can I contact YANHAO for more information or to request customization?

  • You can contact us through phone, email, or an online contact form. Our expert team is ready to provide technical guidance, product information, and customized solutions tailored to your specific requirements. Please refer to the contact information on this product page for detailed contact options.

6. In which industries are YANHAO’s Class 400 Flanges applicable?

  • YANHAO’s Class 400 Flanges find wide applications across various industries, including oil and gas, chemical, power generation, petrochemical, water treatment, manufacturing, aerospace and defense, shipbuilding, mining, food and beverage processing, pharmaceuticals, and more. They are used wherever high-pressure piping systems are required.

7. What is the typical delivery time for YANHAO’s Class 400 Flanges?

  • Delivery times depend on factors such as the order size, customization requirements, and current inventory. We strive to fulfill your orders as quickly as possible to ensure timely delivery. You can inquire with our customer support team for specific delivery timeframes.

8. Does YANHAO offer international shipping services for Class 400 Flanges?

  • Yes, YANHAO provides international shipping services. We have an extensive global distribution network to safely deliver Class 400 Flanges to your location.

9. Does YANHAO offer post-sales support and technical consultation?

  • Yes, we offer comprehensive post-sales support and technical consultation services. Whether you need assistance with product selection, installation, maintenance, or troubleshooting specific issues, our professional team is available to provide support and guidance.

10. Does YANHAO’s Class 400 Flanges come with a warranty?
– We provide warranties for our products, guaranteeing their performance under normal operating conditions. Warranty terms and conditions may vary depending on the specific product type and contractual agreements.

11. Are there minimum order quantity requirements?
– Minimum order quantity requirements are determined by the specifications and customization needs of the Class 400 Flanges you select. We strive to accommodate your order requirements, whether they involve large or small quantities.

If you have any other questions or specific requirements, please feel free to contact our customer support team. We are here to provide the information and support you need, and we look forward to delivering high-quality Class 400 Flanges and exceptional customer service.

Lewis Liu

Hello, I am Lewis Liu, a professional sales engineer with over ten years of experience in the flange fittings industry. I am highly knowledgeable in flange selection, installation, and maintenance. I am passionate about providing customers with the best solutions to ensure their pipeline systems run smoothly, safely, and reliably.

If you have any questions or concerns regarding flange fittings for your pipelines, whether it’s about selection, material choice, specification requirements, or any other aspect, please feel free to contact me at any time. I am committed to offering professional advice and assistance to help you make informed decisions and meet your needs.

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