On this page 5 sections
Key features of blind flanges
- Solid disc closure
- Pressure testing and future tie-ins
- Available tapped or drilled
- All classes
Blind Flanges by material
Blind Flanges are available in the following grades. Select a grade for specifications and sizes.
Stainless Steel
- SS 304 Blind Flanges
- SS 304L Blind Flanges
- SS 304H Blind Flanges
- SS 309S Blind Flanges
- SS 310S Blind Flanges
- SS 316 Blind Flanges
- SS 316L Blind Flanges
- SS 316Ti Blind Flanges
- SS 317 Blind Flanges
- SS 317L Blind Flanges
- SS 321 Blind Flanges
- SS 321H Blind Flanges
- SS 347 Blind Flanges
- SS 347H Blind Flanges
- SS 410 Blind Flanges
- SS 904L Blind Flanges
- Duplex 2205 Blind Flanges
- Super Duplex 2507 Blind Flanges
- SS 254 SMO Blind Flanges
Nickel Alloys
- Inconel 600 Blind Flanges
- Inconel 601 Blind Flanges
- Inconel 625 Blind Flanges
- Inconel 718 Blind Flanges
- Incoloy 800 Blind Flanges
- Incoloy 800H Blind Flanges
- Incoloy 800HT Blind Flanges
- Incoloy 825 Blind Flanges
- Monel 400 Blind Flanges
- Hastelloy C22 Blind Flanges
- Hastelloy C276 Blind Flanges
- Nickel 200 Blind Flanges
- Nickel 201 Blind Flanges
Carbon Steel
Alloy Steel
Blind 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 blind 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 blind flanges?
The product specification for the grade, with dimensions to the relevant ASME or EN standard.
What are blind flanges used for?
Pressure testing and future tie-ins. They take high bending loads at higher classes, and are used for pressure tests, future extensions and inspection access.
Which materials are blind flanges available in?
Stainless steel, nickel alloys, carbon and alloy steel and non-ferrous metals, depending on the specification. See the material list above.