On this page 5 sections
Key features of threaded flanges
- NPT / BSP threads
- No welding required
- Low-pressure utility service
- Common for galvanised systems
Threaded Flanges by material
Threaded Flanges are available in the following grades. Select a grade for specifications and sizes.
Stainless Steel
- SS 304 Threaded Flanges
- SS 304L Threaded Flanges
- SS 304H Threaded Flanges
- SS 309S Threaded Flanges
- SS 310S Threaded Flanges
- SS 316 Threaded Flanges
- SS 316L Threaded Flanges
- SS 316Ti Threaded Flanges
- SS 317 Threaded Flanges
- SS 317L Threaded Flanges
- SS 321 Threaded Flanges
- SS 321H Threaded Flanges
- SS 347 Threaded Flanges
- SS 347H Threaded Flanges
- SS 410 Threaded Flanges
- SS 904L Threaded Flanges
- Duplex 2205 Threaded Flanges
- Super Duplex 2507 Threaded Flanges
- SS 254 SMO Threaded Flanges
Nickel Alloys
- Inconel 600 Threaded Flanges
- Inconel 601 Threaded Flanges
- Inconel 625 Threaded Flanges
- Inconel 718 Threaded Flanges
- Incoloy 800 Threaded Flanges
- Incoloy 800H Threaded Flanges
- Incoloy 800HT Threaded Flanges
- Incoloy 825 Threaded Flanges
- Monel 400 Threaded Flanges
- Hastelloy C22 Threaded Flanges
- Hastelloy C276 Threaded Flanges
- Nickel 200 Threaded Flanges
- Nickel 201 Threaded Flanges
Carbon Steel
Alloy Steel
Threaded Flanges: sizes, finishes and testing
- Size range
- NPS ½" – 24" (B16.5), 26" – 60" (B16.47 Series A/B); Class 150, 300, 600, 900, 1500, 2500; EN 1092-1 PN 6 – PN 100 on request
- Finish
- Raised face (RF), flat face (FF) or ring-type joint (RTJ); serrated spiral or concentric face finish (typically 3.2 – 6.3 µm Ra)
- Ends
- Weld-neck bevel matched to pipe schedule; socket bore; threaded
Testing & documents
- Chemical and mechanical tests of the forging
- Dimensional inspection to ASME B16.5 / B16.47
- Hardness, impact and IGC tests as specified
- Ultrasonic testing of forgings on request
- EN 10204 3.1 certificate; 3.2 with third-party inspection
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Other flanges types
Frequently asked questions
What sizes are threaded flanges available in?
NPS ½" – 24" (B16.5), 26" – 60" (B16.47 Series A/B); Class 150, 300, 600, 900, 1500, 2500; EN 1092-1 PN 6 – PN 100 on request.
Which specifications cover threaded flanges?
The product specification for the grade, with dimensions to the relevant ASME or EN standard.
What are threaded flanges used for?
No welding required. That makes them useful where welding isn't allowed, for example in explosive areas or on galvanised pipe, in low-pressure, non-cyclic service.
Which materials are threaded flanges available in?
Stainless steel, nickel alloys, carbon and alloy steel and non-ferrous metals, depending on the specification. See the material list above.