Blind Flange
Blind Flanges
Precision-engineered Blind Flanges manufactured for reliable pipe isolation, pressure containment and industrial piping applications across demanding process and engineering environments.
- Blind Flanges
- ASME Flanges
- ANSI Flanges
- DIN Flanges
- BS Flanges
- EN Flanges
- 150–2500 LBS
- Custom Flanges
Blind Flanges Manufacturer & Supplier
Sawariya Metal Industries is a manufacturer, supplier, stockist and exporter of high-quality Blind Flanges for industrial piping and pressure systems. We offer Blind Flanges in a wide range of sizes, pressure classes, materials, face types and dimensional configurations.
Blind Flanges are solid flanges used to close the end of a piping system, nozzle or pressure vessel opening. They are designed to provide a secure termination and can also facilitate access for inspection, maintenance and future system modifications.
Our Blind Flanges are supplied for domestic and international requirements across industries such as oil & gas, petrochemical, chemical processing, power generation, marine, sugar, nuclear, defence, fabrication and general engineering.
Key Features of Blind Flanges
Pressure Containment
Designed for reliable closure and pressure isolation in piping systems.
Multiple Pressure Classes
Available from 150 LBS through 2500 LBS and selected DIN ratings.
Multiple Face Types
FF, RF and RTJ configurations available for different applications.
Wide Material Selection
Stainless steel, duplex, alloy steel, carbon steel and nickel alloys.
Blind Flanges Specifications
| Specification | Details |
|---|---|
| Dimensions | ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges & Custom Dimensions |
| Standards | ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings |
| Pressure Class | 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS |
| DIN Pressure Rating | ND-6, ND-10, ND-16, ND-25, ND-40 & Others |
| Size | 1/8" NB to 48" NB |
| Flange Face Type | Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ) |
| Manufacturing | Forged / Machined / Custom Manufactured |
| Customization | Available as per customer drawings and specifications |
DIN Blind Flange Standards
| Standard | Applicable DIN Specifications |
|---|---|
| DIN | DIN 2527, DIN 2566, DIN 2573, DIN 2576, DIN 2641, DIN 2642, DIN 2655, DIN 2656 |
| DIN | DIN 2627, DIN 2628, DIN 2629, DIN 2631, DIN 2632, DIN 2633, DIN 2634, DIN 2635 |
| DIN | DIN 2636, DIN 2637, DIN 2638, DIN 2673 |
ANSI & BS Blind Flange Standards
ANSI Standards
ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36 and ANSI B16.48.
BS Standards
BS 4504, BS 1560 and BS 10.
Custom Requirements
Blind Flanges can be manufactured according to approved customer drawings and specifications.
Blind Flanges Material & Grades
Stainless Steel Blind Flanges
ASTM A182 / A240 F304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H and 904L.
Duplex & Super Duplex
ASTM / ASME A/SA 182 F44, F45, F51, F53, F55, F60 and F61.
Alloy Steel
ASTM / ASME A/SA 182 & A387 F1, F5, F9, F11, F12, F22 and F91.
Carbon Steel
ASTM / ASME A/SA 105, A350, A181 LF2, A516 Gr.70, A36 and A694 grades.
Nickel Alloy
ASTM SB564, SB160, SB472 and SB162 including Nickel, Monel, Inconel, Hastelloy and Alloy 20 grades.
Copper Alloy
ASTM SB61, SB62, SB151 and SB152 including Cu-Ni 90/10, Cu-Ni 70/30 and selected copper grades.
Available Blind Flange Materials
| Material Category | Grades / Specifications |
|---|---|
| Stainless Steel | ASTM A182 / A240 F304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L |
| Duplex & Super Duplex | F44, F45, F51, F53, F55, F60, F61 |
| Alloy Steel | F1, F5, F9, F11, F12, F22, F91 |
| Carbon Steel | A105, A350, A181 LF2, A516 Gr.70, A36, A694 F42, F46, F52, F60, F65, F70 |
| Nickel Alloys | Nickel 200, Nickel 201, Monel 400, Monel 500, Inconel 600, Inconel 601, Inconel 625, Inconel 800, Inconel 825, Hastelloy C276, Alloy 20 |
| Copper Alloys | Cu-Ni 90/10, Cu-Ni 70/30 and selected UNS copper grades |
Blind Flange Face Types
Flat Face (FF)
Flat sealing face configuration used for suitable low-pressure and piping applications.
Raised Face (RF)
Raised sealing surface designed for common industrial pressure piping applications.
Ring Type Joint (RTJ)
Precision-machined groove configuration for demanding high-pressure applications.
Dimensional Tolerances of Blind Flanges
The following dimensional tolerance information is presented based on the supplied ASME B16.5 reference data. Final dimensional requirements should be verified against the applicable edition of the governing standard.
| Parameter | Tolerance / Requirement |
|---|---|
| Outside Diameter | ≤ 24 = 1.6 mm | > 24 = ± 3.2 mm |
| Inside Diameter | Not Applicable |
| Diameter of Contact Face | 1.6 mm Raised Face = ± 0.8 mm 6.35 mm Raised Face / Tongue & Groove / Male-Female = ± 0.4 mm |
| Outside Diameter of Hub | ≤ 12 = +2.4 / −1.6 mm ≥ 14 = ±3.2 mm |
| Diameter of Counterbore | Not Applicable |
| Drilling – Bolt Circle | 1.6 mm |
| Bolt Hole Spacing | ±0.8 mm |
| Eccentricity of Bolt Circle | ≤ 2½ = 0.8 mm max. ≥ 3 = 1.6 mm max. |
| Thickness | ≤ 18 = +3.2 / −0 mm ≥ 20 = +4.8 / −0 mm |
| Length Through Hub | ≤ 18 = +3.2 / −0.8 mm ≥ 20 = +4.8 / −1.6 mm |
Applications of Blind Flanges
- Oil & Gas
- Petrochemical Plants
- Chemical Processing
- Power Generation
- Marine Industry
- Sugar Industry
- Nuclear Industry
- Defence Industry
- Refineries
- Process Piping
- Pressure Vessels
- Industrial Fabrication
Quality & Inspection
Precision-Controlled Blind Flanges
Blind Flanges can be supplied with inspection and documentation according to the applicable standard, purchase order and customer-specific requirements.
- Dimensional inspection
- Visual and surface inspection
- Material grade verification
- Chemical composition verification
- Mechanical testing as applicable
- Hardness testing as applicable
- Flange face inspection
- Bolt-hole and drilling inspection
- Non-destructive testing as applicable
- Mill Test Certificate (MTC)
- Third-party inspection support
- Customer-specific documentation
Why Choose Our Blind Flanges?
Wide Size Range
Blind Flanges available from 1/8" NB up to 48" NB.
Multiple Pressure Classes
150, 300, 600, 900, 1500 and 2500 LBS options.
Extensive Materials
Stainless steel, duplex, alloy steel, carbon steel, nickel and copper alloys.
Custom Manufacturing
Manufacturing options available according to drawings and project requirements.
Blind Flanges Manufacturer in India
Blind Flanges are solid flange components used to close the end of a pipe, nozzle or pressure vessel connection. They are widely used in industrial piping systems for isolation, pressure containment, inspection and maintenance requirements.
Sawariya Metal Industries supplies Blind Flanges in stainless steel, carbon steel, alloy steel, duplex and super duplex steel, nickel alloys and copper alloys. Our Blind Flanges are available in ANSI, ASME, DIN, BS and EN configurations with different pressure classes and flange face types.
We offer ANSI Blind Flanges, ASME Blind Flanges, Stainless Steel Blind Flanges, Carbon Steel Blind Flanges, Duplex Blind Flanges, Alloy Steel Blind Flanges and Nickel Alloy Blind Flanges for industrial and engineering applications.
Related Flange Products
Weld Neck Flanges
High-strength flange configuration for demanding piping systems.
Slip On Flanges
Versatile flange solution for a wide range of industrial piping.
Socket Weld Flanges
Compact flange configuration for suitable high-pressure piping.
Threaded Flanges
Threaded connection solution for selected piping applications.
Lap Joint Flanges
Suitable for applications requiring convenient alignment and assembly.
Orifice Flanges
Flange assemblies used in flow measurement applications.
Technical Note:
Dimensions, tolerances, pressure ratings, materials and applicable standards should be verified against the latest governing ASTM, ASME, ANSI, DIN, BS or EN specification, approved drawings, purchase order and Mill Test Certificate before final procurement or engineering use.