WN
Weld Neck Flange
Hubbed weld neck / Taper hub
The weld neck flange is butt-welded to the pipe through its tapered hub, so th...
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Weld neck, slip-on, blind, socket weld, lap joint and large diameter custom flanges, produced to the standards you specify.
Product overview
Six flange families for standard and custom requirements
SO
Slip-On Flange
Plate flange / Hubbed slip-on
The slip-on flange accepts the pipe through its bore and is fillet-welded on t...
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BL
Blind Flange
Flange cover / Blanking flange
The blind flange is a solid flange cover without a central bore...
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SW
Socket Weld Flange
SW flange
The socket weld flange has a bored recess that accepts the pipe, which is then...
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LJ
Lap Joint Flange
Loose flange with stub end
A lap joint flange is used together with a stub end...
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LD
Large Diameter Flange
Custom & heavy-duty flanges
Large diameter flanges serve oil and gas trunk lines, water conservancy projec...
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Other types and fittings
These items are also within our supply scope
Threaded flange
Hubbed slip-on flange
Spectacle blind
Flange cover
Stub end
Reducing flange
Plate flange
Anchor flange
Non-standard parts
Standards
International standards we produce to
| Standard system | Standard numbers | Typical pressure ratings |
|---|---|---|
| ASME / ANSI | B16.5, B16.47 Series A/B, B16.36 | Class 150 / 300 / 600 / 900 / 1500 / 2500 |
| EN 1092-1 | Type 01 / 02 / 05 / 11 / 13 | PN6 – PN100 |
| DIN | 2573 / 2576 / 2632 / 2633 / 2566 | PN6 – PN40 |
| JIS B2220 | JIS B2220 | 5K – 30K |
| BS 4504 | BS 4504 | PN6 – PN40 |
| GOST | GOST 12820 / 12821 | PN6 – PN40 |
| UNI | UNI 2277 / 2278 | PN6 – PN40 |
The ranges above are typical; final specifications are confirmed at quotation.
Materials and surface treatment
Match the material to the service and the finish to transport and storage conditions
| Category | Common grades and typical service |
|---|---|
| Carbon steel | A105, A350 LF2, Q235, 20#, 16Mn General-purpose choice for ambient to medium temperature lines, best value |
| Stainless steel | 304 / 304L, 316 / 316L, 321 Corrosive media, food and pharmaceutical lines |
| Alloy steel | F1, F5, F9, F11, F22, F91 High-temperature high-pressure steam and hydrogen service |
| Duplex steel | F51 (2205), F53, F55 Seawater, chloride and highly corrosive environments |
Surface treatment options
Rust-preventive oilBlack anti-rust paintHot-dip galvanizingElectro-galvanizingEpoxy powder coatingSand blasting
Customisation
Build to print, with a feasibility review
- Non-standard flanges and special shapes built to your drawings, with a feasibility review of critical dimensions
- Reverse engineering from samples to recover original dimensions
- Oversize flanges and heavy components from DN1500 to DN5000
- Special materials, special heat treatment and special dimensional tolerances
- Small trial orders and fast sampling so new customers can verify quality first
What we need to quote
- Standard number (e.g. ASME B16.5) or a drawing
- Size and pressure rating
- Material and face type
- Quantity, required date and destination port
- Whether third-party inspection or special packing is needed
Cannot find the specification you need?
A large share of our work is non-standard and custom. Send us the drawing or a sample and we will take it from there.