What are the international standards for threaded flanges?
Nov 24, 2025
Hey there! As a threaded flange supplier, I often get asked about the international standards for threaded flanges. So, I thought I'd write this blog to share some insights on this topic.
First off, let's understand what threaded flanges are. Threaded flanges are a type of flange that have threads inside the bore. They're used to connect pipes, valves, or other equipment in a piping system. They're pretty handy because they don't require welding, which makes installation and removal a breeze.
Now, onto the international standards. There are several well - known standards that govern the design, dimensions, and performance of threaded flanges.
ASME B16.5
One of the most widely recognized standards is ASME B16.5. This standard is from the American Society of Mechanical Engineers. It covers pipe flanges and flanged fittings in sizes NPS 1/2 through NPS 24 for pressure classes 150, 300, 400, 600, 900, 1500, and 2500.
ASME B16.5 specifies the dimensions, tolerances, and materials for threaded flanges. For example, it details the outside diameter, bolt circle diameter, and the number and size of bolts for each pressure class and size. The materials can range from carbon steel to stainless steel, depending on the application. If you're working on a project in North America or a place that follows American engineering practices, this is the standard you'll likely be dealing with.
EN 1092 - 1
In Europe, the EN 1092 - 1 standard is the go - to for flanges. It's part of a series of European standards for flanges. This standard covers flanges in sizes DN 10 to DN 4000 for various pressure ratings.
EN 1092 - 1 has different flange types and facing designs compared to ASME B16.5. It also has specific requirements for materials and manufacturing processes. For instance, the flange facing can be flat face, raised face, or ring joint face, each with its own application scenarios. If you're supplying threaded flanges to European customers, you need to make sure your products comply with this standard.
JIS B2220
Japan has its own standard, JIS B2220, for flanges. It covers flanges in sizes from 10A to 2000A for different pressure ratings. JIS flanges have unique dimensions and facing designs. The materials and manufacturing criteria are also defined according to Japanese industry requirements. If you're targeting the Japanese market or projects in Asia that follow Japanese standards, you'll need to adhere to JIS B2220.
ISO 7005 - 1
The International Organization for Standardization (ISO) also has a standard for metallic flanges, ISO 7005 - 1. This standard is a bit of a bridge between different regional standards. It aims to provide a common set of requirements for flanges on an international level. It covers flanges in sizes DN 10 to DN 3000 for various pressure ratings.
ISO 7005 - 1 helps in ensuring that flanges can be used interchangeably in different parts of the world, which is great for global projects. However, it's important to note that while it's an international standard, local regulations and customer preferences may still require compliance with regional standards.
Why These Standards Matter
These standards are super important for several reasons. Firstly, they ensure the compatibility of threaded flanges with other components in the piping system. For example, if you're using a threaded flange to connect a pipe and a valve, the standard dimensions ensure that they fit together properly.
Secondly, they guarantee the safety and reliability of the piping system. Standards define the minimum requirements for materials, thickness, and manufacturing processes. This means that a threaded flange made to a recognized standard is less likely to fail under normal operating conditions.
Lastly, compliance with international standards can open up new markets for us as suppliers. Customers around the world trust products that meet well - known standards. It gives them confidence in the quality of the threaded flanges they're purchasing.
Our Product Range
At our company, we offer a wide range of threaded flanges that comply with these international standards. We have Tapped Blind Flange, which are used to close the end of a pipe. They're great for applications where you need to block off a pipeline temporarily or permanently.
Our Galvanized Pipe NPT Threaded Flange are coated with zinc to prevent corrosion. They're ideal for outdoor or wet environments where rust could be a problem.
We also have Reducing Threaded Flange, which are used to connect pipes of different sizes. These are very useful in piping systems where you need to change the pipe diameter.
Conclusion
In conclusion, understanding the international standards for threaded flanges is crucial for both suppliers and customers. Whether it's ASME B16.5 in the Americas, EN 1092 - 1 in Europe, JIS B2220 in Japan, or ISO 7005 - 1 on a global scale, these standards ensure the quality, compatibility, and safety of threaded flanges.
If you're in the market for high - quality threaded flanges that meet international standards, we'd love to hear from you. We're committed to providing the best products and services to our customers. Whether you have a small project or a large - scale industrial application, we can supply the right threaded flanges for you. Reach out to us to start a procurement discussion and find the perfect solution for your needs.
References
- ASME B16.5 - Pipe Flanges and Flanged Fittings
- EN 1092 - 1 - Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated - Part 1: Steel flanges
- JIS B2220 - Pipe Flanges and Flanged Fittings
- ISO 7005 - 1 - Metallic flanges - Part 1: Steel flanges