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Spectacle Blind Flanges

Spectacle Blind Flanges are specialized types of piping components used primarily to isolate sections of pipe or equipment. These flanges consist of a metal disc, which is connected by a tie bar — one end is a solid plate to stop the flow, and the other is an open ring to allow flow when needed. They are commonly used in maintenance operations, where flow alternation is necessary without removing the entire flange setup.

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These flanges are available in a variety of materials, including Stainless Steel, Carbon Steel, Duplex & Super Duplex, High Nickel Alloys, Monel, Inconel, Hastelloy, and Alloy Steel. Designed as per international standards such as ANSI B16.5 and ASME B16.47, they are suitable for use in both low- and high-pressure applications across multiple industries.

Spectacle Blind Flanges are ideal for pipeline isolation, flow maintenance, and safety shut-off in systems that require frequent servicing or pressure testing. One of the key benefits is that they can be installed without welding, which is particularly useful in environments where hot work is restricted. Their unique design allows for quick switching between operational and blocking modes.

These flanges are exported to a wide range of countries, including Qatar, Bahrain, Saudi Arabia, Indonesia, United States, Singapore, Malaysia, Turkey, UAE, Russia, Ukraine, South Africa, and Australia. With a strong international presence, these products are trusted for their dimensional accuracy, durability, and corrosion resistance in aggressive environments.

Spectacle Blind Flanges are also available in custom-built sizes, face types (RF, FF, RTJ), and pressure classes to meet client-specific requirements. Specialists in manufacturing to standards such as MSS SP-44, manufacturers also provide Inconel, Duplex, and other high-performance alloy options for critical applications in chemical processing, oil & gas, and power generation industries.

Why choose Spectacle Blind Flanges ?

  • Easy isolation of pipeline sections
  • No welding required for installation
  • Reusable and simple to operate
  • Ideal for maintenance and safety shut-off
  • Available in a wide range of materials and sizes

Spectacle Blind Flanges

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Spectacle Blind Flanges Manufacturing Material & Grades:-

Carbon Steel Spectacle Blind Flanges:

ASTM / ASME A/SA 105 ASTM / ASME A 350 , ASTM A 181 LF 2 / A516 Gr.70 A36, A694 F42, F46, F52, F60, F65, F70, ASTM A350, LF2, LF3

Duplex & Super Duplex Spectacle Blind Flanges:

ASTM / ASME A/SA 182 F 44, F 45, F51, F 53, F 55, F 60, F 61, 2205 (UNS No. S31803), 2507 (UNS No. S32750)

Copper Alloy Steel Spectacle Blind Flanges:

UNS No. C 10100, 10200, 10300, 10800, 12000, 12200, 70600, 71500, UNS No. C 70600 (Cu -Ni- 90/10), C 71500 (Cu -Ni- 70/30)

Nickel Alloy Spectacle Blind Flanges:

ASTM SB564, SB160, SB472, SB162 Nickel 200 (UNS No. N02200), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601), Hastelloy C 276 (UNS No. N10276), Alloy 20 (UNS No. N08020).

Stainless Steel Spectacle Blind Flanges:

ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H,904L

Leading Manufacturers of Spectacle Blind Flanges& Other Ready Inventory of Spectacle BlindFlanges:-

A wide range of Spectacle Blind Flanges is manufactured and exported in accordance with global standards such as ANSI B16.5, ANSI B16.47, MSS SP-44, DIN-2527, and BS-4504. These include flanges made from Stainless Steel, Carbon Steel, Duplex & Super Duplex Steel, Alloy Steel, Inconel, Monel, Hastelloy, Titanium, Alloy 20, Copper Nickel, and Nickel Alloys.

Available in various pressure classes such as 150 LBS, 300 LBS, 600 LBS, and beyond, these flanges are designed for use in critical isolation applications across industries like oil & gas, chemical processing, marine, power plants, and more.

Inventory includes products ready for delivery to regions such as Saudi Arabia, Qatar, Malaysia, UAE, and the United States, offering reliable solutions tailored to international specifications and unique project needs.

Special Grades & Customization Options

Spectacle Blind Flanges are offered in a wide selection of special material grades to suit critical applications in industries such as oil & gas, petrochemical, marine, and power generation. Available materials include Stainless Steel (304, 316, 321, 904L), Duplex and Super Duplex (2205, 2507), Inconel, Monel, Hastelloy, Alloy 20, Titanium, and Copper Nickel alloys. These grades are chosen for their superior corrosion resistance, mechanical strength, and temperature tolerance.

In addition to material flexibility, customization options are available to meet unique project requirements. These include non-standard sizes, special pressure classes, custom drilling templates, flange face types (RF, FF, RTJ), and protective surface coatings. Tailor-made solutions ensure that every Spectacle Blind Flange delivers precision performance and long-term durability in the most demanding environments.

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Commitment to Quality & Certifications

Every Spectacle Blind Flange is manufactured with a strong focus on quality, reliability, and compliance with international standards. From raw material selection to final inspection, strict quality control processes are followed to ensure dimensional accuracy, surface finish, and mechanical integrity. Products undergo rigorous testing, including hydrostatic, ultrasonic, PMI, hardness, and destructive/non-destructive examinations.

Flanges are supplied with full certification and traceability, including Mill Test Certificates (EN 10204 3.1/3.2), NACE MR0175/ISO 15156 compliance, and relevant ASME, ANSI, ASTM, DIN, and BS standards. This commitment to quality ensures that each flange meets or exceeds the expectations of global customers across critical industries.

As your one-stop manufacturing partner, Sunrise Industries maintains a complete inventory of ready-to-sell raw materials alongside custom parts fabrication and full engineering services. From prototyping to production, we provide everything at a single location—serving all industrial sectors and transforming manufacturing value chains.

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