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.
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 DN10 to DN150 in PN6 through PN40 per DIN/HG standards, and Class 150–300 (PN20–PN50) per ASME B16.5. 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.
Longan Flange supplies threaded flanges across both DIN/HG PN ratings and ASME Class ratings, covering DN10 to DN150. Select the standard and rating that matches your project specification below — full dimensional tables are available further down this page.
| Standard | Pressure Rating | DN Range | Reference Standard No. |
|---|---|---|---|
| DIN / HGEurope | PN6 | DN10 – DN150 | HG/T20598-2009(Th) |
| DIN / HGEurope | PN10 | DN10 – DN150 | HG/T20598-2009(Th) |
| DIN / HGEurope | PN16 | DN10 – DN150 | HG/T20598-2009(Th) |
| DIN / HGEurope | PN25 | DN10 – DN150 | HG/T20598-2009(Th) |
| DIN / HGEurope | PN40 | DN10 – DN150 | HG/T20598-2009(Th) |
| ASMEAmericas | Class 150 (≈ PN20) | DN15 – DN150 | HG/T20620-2009(Th) |
| ASMEAmericas | Class 300 (≈ PN50) | DN15 – DN150 | HG/T20620-2009(Th) |
PN-to-Class equivalence shown above (e.g. Class 150 ≈ PN20) reflects the manufacturer’s catalog labeling convention and is approximate, not an exact regulatory conversion — please confirm the exact standard required for your project at the RFQ stage.
Threaded flanges offer convenient installation and maintenance, allowing for easy assembly and disassembly without welding, reducing additional torque and deformation.
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.
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.
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.
Our stainless steel threaded flanges are available from DN10 to DN150, covering PN6 through PN40 as well as ASME Class 150 and Class 300 (PN20/PN50). Threaded flange dimensions for each class are in the tables above.
MOQ from 1 piece. Standard sizes in 2–4 weeks. Quotes within 24 hours.
+86-15727821389 +86-15355931307
Tel: +86-15727821389
E-mail: mft@longanflange.com
mft001@longanflange.com
Address: 620 Kongo Mingzhu Road, Yongxing Street, Longwan District, Wenzhou City, Zhejiang Province, China.
