What is a Threaded Flange and When Should You Use It?

When working on piping systems, especially in industrial projects, one question comes up quite often:

Do we really need welding, or is there a simpler way to connect pipes?

That’s exactly where threaded flanges come in.

What is a Threaded Flange

A threaded flange (also called a screwed flange) is designed with internal threads, allowing it to be directly screwed onto a pipe with matching external threads.

Unlike welded flanges, it does not require any welding during installation, which makes it a practical solution in many real-world situations.

From a structural point of view, the connection relies on thread engagement rather than fusion, so installation is faster and easier.

Why Threaded Flanges Are Still Widely Used

In theory, welded connections are stronger. But in practice, threaded flanges still have their place.

Here’s why many projects still choose them:

• No welding required → safer in hazardous environments
• Easy installation → reduces labor cost
• Easy to remove → ideal for maintenance
• Suitable for on-site assembly

In some industries, especially where hot work is restricted, threaded flanges are often the only viable option.

Typical Applications

Threaded flanges are usually used in:

• Water supply systems
• Low-pressure pipelines
• Utility piping
• Galvanized pipe systems
• Temporary or maintenance-heavy systems

They are most commonly applied in small diameter pipelines (≤ 4 inch) and lower pressure classes.

Limitations You Should Know

Threaded flanges are convenient, but they are not suitable for every situation.

From an engineering perspective, there are a few limitations:

• Not ideal for high-pressure systems
• May leak under vibration
• Not recommended for high temperature conditions
• Thread connection creates a potential leak path

Because of these factors, welded flanges are usually preferred in critical systems.

Threaded Flange vs Welded Flange (Simple View)

In real projects, the decision is usually straightforward:

• If you need strength and sealing → go with welded flange
• If you need flexibility and easy installation → threaded flange works better

Many pipeline systems actually use both, depending on different sections.

A Practical Tip for Buyers

One mistake many buyers make is focusing only on “type”.

But in reality, these factors matter just as much:

• Material (A105, stainless steel, alloy steel)
• Standard (ASME, DIN, JIS)
• Pressure rating
• Thread type (NPT / BSP)

Getting these right early can save a lot of trouble later.

Need Help Choosing the Right Threaded Flange?

If you're sourcing threaded flanges for a project and not fully sure about the specifications, it's always better to confirm before ordering.

You can check detailed specs here:
👉 https://www.senruipipe.com/products/threaded-flange

Or just send your requirements, such as:

• Size
• Material
• Pressure class
• Quantity

We’ll help you match the right type and give you a quick quote.

Final Thoughts

Threaded flanges are not a replacement for welded flanges, but they are a smart solution in the right situations.

Choosing the right connection method is less about “which is better” and more about what your project actually needs.