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Blind Flange
Blind flanges (Blank flanges) are used to close off the ends of pipes, valves, or other equipment, providing a secure seal.
High-Pressure Pipe Sealing Solutions for Industrial Infrastructure A Blind Flange (also referred to as a ‘Blank Flange’ or ‘BL’) is a solid steel disk with no bore, designed to seal the end of a piping system, pressure vessel, or valve opening. Unlike other flanges, its primary function is to withstand the highest mechanical stress due to internal pressure and bolt loading. At JS FITTINGS, our blind flanges are engineered to facilitate easy access for maintenance or future expansions of the pipeline. They are critical components in hydro-testing and isolating segments of a piping network. ASME B16.5, ANSI/ASME B16.47 Series A/B, DIN 2527, EN 1092-1, JIS B2220, MSS-SP-44 Class 150, 300, 400, 600, 900, 1500, 2500 (PN6 to PN400) CS: A105, A350 LF2; SS: F304/L, F316/L, F321; AS: F11, F22, F91 Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Tongue & Groove (T&G)Blind Flanges (BL) – ASME B16.5 & ANSI Standards
What is a Blind Flange?
Technical Specification
Manufacturing Standards
Pressure Ratings
Material Grades
Facing Types
ASME B16.5 Blind Flange Dimensions (Class 150)
| Nominal Size (NPS) | Outer Diameter (O) – mm | Thickness (C) – mm | Bolt Circle (W) – mm | Weight (Approx) – kg |
|---|---|---|---|---|
| 1/2″ | 90 | 11.2 | 60.3 | 0.5 |
| 2″ | 150 | 19.1 | 120.7 | 3.2 |
| 4″ | 230 | 23.9 | 190.5 | 7.7 |
| 8″ | 345 | 28.5 | 298.5 | 21.3 |
More details size, please contact us to get.
Why Choose JS FITTINGS Blind Flanges?
Cangzhou-Based Manufacturing Hub
Operating from our 30,000㎡ production facility with an annual capacity exceeding 5,000 tons, ensuring stable supply for mega-projects.
Stock Advantages
We maintain a vast inventory for same-day shipping of standard sizes and pressure classes.
Certified Quality
Fully certified under ISO 9001, CE, and API 6A. Every flange undergoes 100% PMI testing to verify material chemistry before dispatch.
End-to-End Technical Support
Comprehensive engineering assistance, from 3D modeling validation to detailed bolt torque specifications for onsite installation.
Ready to Source ASME B16.5 Blind Flanges?
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Testimonials
“This product is exactly in line with our requirement technically and competitive commercially.”
Anton
Russia
“The flanges are exactly in line with our requirement technically and competitive commercially.”
Boran
Turkey
“We tested the elbows and flanges, their performance is very nice. We will make the new purchase plan for the warehouse.”
Farir
Oman
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