Threaded Flanges

INTRO

The threaded flange is a kind of flange connected with the pipe by the thread, it offers a seamless and efficient solution for high-pressure pipeline connections.

With its internal pipe thread, it allows for easy assembly and disassembly without the need for welding.

This innovative design minimizes additional torque and deformation, ensuring a secure fit with minimal cost.

Standard：
GB/T9119-2010 HG/T20592-2009 HG/T20615-2009 DIN ASME BS JIS

Material：
304：F304 S30408 S30408II S30408III S30400
304L：S30403 S30403II 30403 30403II
316L：31603 31603II 31603III
2507（F53） 2205（F51） TP310S（06Cr5Ni20） TP321（06Cr18Ni11） S22053III=2205III T321-32168=321

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DESCRIPTION DOWNLOAD

The threaded flange is a kind of non-welded flange that processes the inner hole of the flange into a pipe thread and is connected with a pipe with a thread. Compared with the flat welded flange or butt welded flange, the threaded flange has the characteristics of convenient installation and maintenance.For more information, please see the download section on the right.

Manufacturer Intro

Longan Flange manufactures stainless steel threaded flanges that connect to pipes via NPT or BSP threads — no welding required. This makes threaded flanges ideal for low-pressure systems, retrofit installations, and applications involving flammable materials where hot work is restricted. Our threaded flanges cover DN15 to DN100 in Class 150 through Class 2500 per ASME B16.5, DIN, and GOST. Available in SS304, 304L, 316L, duplex 2205, and super duplex 2507. All flanges forged and machined in-house at our Wenzhou facility. ISO 9001 & PED certified. Quote within 24 hours.

Frequently Asked Questions (FAQs)

What are the advantages of using a threaded flange?

Threaded flanges offer convenient installation and maintenance, allowing for easy assembly and disassembly without welding, reducing additional torque and deformation.

When should I use threaded flanges?

Use a threaded flange when you need a non-welded, easy-to-install connection for pipes, especially in applications where frequent disassembly or maintenance is required, and welding is impractical. It is ideal for situations where reduced installation cost and simplicity are priorities.

How do I install a threaded flange?

To install a threaded flange: clean and align the flange with the pipe, thread it on by hand, tighten with a pipe wrench, check alignment, and apply sealant if needed.

When should I use a threaded flange instead of a welded flange?

Threaded flanges are ideal when welding is not permitted — such as in flammable environments, retrofit installations, or systems requiring frequent disassembly. They connect to pipes via NPT or BSP threads with no hot work required.

What sizes and pressure classes are available?

Our stainless steel threaded flanges are available from DN15 to DN100 in Class 150 through Class 2500 per ASME B16.5, as well as DIN and GOST standards. Threaded flange dimensions for each class are in the tables above.

What is the lead time and MOQ?

MOQ from 1 piece. Standard sizes in 2–4 weeks. Quotes within 24 hours.