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Welding Neck flange
Welding Neck flanges according ASME B16.5 / B16.47 are often used in installations, piping systems, appendages or in equipment construction. Nijhuis & Wigger can supply suitable Welding Neck flanges for every quality, pipe size and pressure class.
- Available pressure classes: 150 lbs - 2500 lbs / 2.000 - 20.000 PSI
- Different schedule sizes available according ASME B 36.10 / 36.19
- Dimensions up to 60”
- Different sealing surfaces available like RF, FF, LRF, RTJ or according specification
- Stock item (see stock programme in downloads)
We deliver Welding Neck flanges in the following material grades:
| ASME standard |
| Carbon steel |
| A/SA105N / C21, P265GH |
| A/SA350 LF2 / P355QH1 |
| A/SA182 Gr. F1,F5,F9,F11,F12,F22,F91. |
| A694 Gr. F52,F60,F65,F70 |
| Stainless steel |
| A/SA182 Gr. 304/304L |
| A/SA182 Gr. 316/316L |
| A/SA182 F321(H) |
| F51(Duplex) / F53(Superduplex) |
| Special Alloys |
| Hastelloy C276/C22 |
According to the ASME standard Welding Neck flanges are separated in:
| ASME standard | Pressure class |
| B16.5 - B16.47 A/B | 150 lbs |
| B16.5 - B16.47 A/B | 300 lbs |
| B16.5 - B16.47 A/B | 400 lbs |
| B16.5 - B16.47 A/B | 600 lbs |
| B16.5 - B16.47 A/B | 900 lbs |
| B16.5 - B16.47 A/B | 1500 lbs |
| B16.5 - B16.47 A/B | 2500 lbs |
Click on one of the PDF logos to start the download.
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Schedule sizes |
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Stock programme |
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Delivery programme |
Machining Welding neck flanges
according standard or specificationWelding Neck flanges can be machined in several ways. For example machining the sealing surface to Smooth Finish (Ra.3.2-6.3) or changing the schedule size.
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Custom made flanges
It is also possible to manufacture special flanges according to your wishes and drawings. Our sales team is happy to
assist you.
