Threaded Flanges Suppliers

ASME B16.5 Screwed Flange

Threaded Flanges Suppliers

ASME B16.5 Threaded Flanges: Dimensions | Specifications | Material Grade | Standards | About Screwed Flange | All Product Types

Threaded Flanges, also known as Screwed Flanges, are designed for use with pipes that have external threads. These flanges are ideal for applications where welding is not possible or desirable, making them suitable for high-pressure systems in small-diameter pipelines. Common thread types include NPT, BSP, and BSPT, depending on the application and region.

These flanges are available in pressure classes ranging from Class 150 to 2500 and are offered with different face types such as Raised Face (RF), Flat Face (FF), and Ring Type Joint (RTJ). Threaded flanges conform to international standards like ASME B16.5, DIN 2565/2566, and EN 1092-1, and are supplied in sizes from ½″ NB to 24″ NB.

At Nutech Overseas, we manufacture and supply threaded pipe flanges in a wide range of materials, including Stainless Steel (304, 304L, 316, 316L), Carbon Steel (ASTM A105), Alloy Steel (F11, F22), and Duplex/Super Duplex grades. These flanges are precisely machined with accurate thread dimensions to ensure leak-proof connections and reliable performance.

Threaded flanges are commonly used in industries such as oil & gas, petrochemicals, power plants, water treatment, and shipbuilding, especially where disassembly is required for maintenance or inspection. They are easy to install and remove without welding, making them a preferred choice for many critical and hazardous environments.

We export high-quality threaded flanges globally, including to key markets like the USA, Europe, and the Middle East, ensuring on-time delivery and full compliance with international standards.

ASME B16.5 Threaded Flanges Manufacturer in Stainless Steel, Carbon Steel, Alloy Steel – Screwed & Forged Threaded Pipe Flanges with Raised Face & Flat Face Ends.

For complete technical details, including dimensions, pressure rating classes, weight charts, sizes, tolerances, and material specifications of our ANSI B16.5 Threaded Flanges, please download the full Catalog PDF below.

Threaded Pipe Flanges (THRF / THFF) Available in Class 150 to 2500 – Sizes ½″ to 24″ – BSP / NPT Threads – Ideal for High-Pressure, Non-Welded Piping Systems.

Technical Specifications of Threaded Flanges

Specification Details
Type Threaded Flange (TH), Threaded Raised Face (THRF), Threaded Flat Face (THFF), Threaded Ring Type Joint (RTJ)
Design Standard ASME B16.5, ANSI B16.5, EN 1092-1, BS 4504, DIN Series
Size Range ½″ NB to 24″ NB (DN15 to DN600)
Pressure Ratings Class 150, 300, 600, 900, 1500, 2500
Thread Types ANSI B1.20.1 NPT (National Pipe Thread), BSP (British Standard Pipe) available on request
Face Type Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ)
Flange Thickness As per ASME B16.5 or other applicable dimensional standard based on pressure class
Hub & Bore Design Center bore with internal threads to connect pipe without welding; optionally counter-bored
Welding Type No welding required; pipe is screwed into the flange thread
Surface Finish Stock finish (3.2–6.3 μm), Smooth finish, Spiral serrated or concentric finish for sealing
Gasket Compatibility Spiral wound, ring type, or full-face gaskets depending on flange face type
Drilling Template Matches ANSI B16.5 or EN 1092-1 bolt hole patterns
Coating / Protection Rust preventive oil, Black paint, Yellow transparent varnish, Hot-dip galvanized (on request)
Dimensional Tolerances As per ASME B16.5, EN 1092-1, or customer-supplied drawings/specifications
Testing & Inspection Hydrostatic test, PMI, Dimensional check, Visual inspection, NDT (if required)
Certification EN 10204 Type 3.1 / 3.2, IBR Approval, ISO 9001, PED 2014/68/EU, NACE MR0175 / ISO 15156, ISO 9001
Application Industries Oil & Gas, Petrochemical, Power Generation, Water Treatment, Food & Beverage, Fire Protection Systems, Pulp & Paper, Shipbuilding, HVAC, Offshore
Origin Made in India (by Nutech Overseas)
Export Network USA, Europe, and Middle East

Complete Material Grade Chart - Class 150 Threaded Flange

Material Category Screwed Flange Grades
Stainless Steel Threaded Flange ASTM A182 F304 / F304L / F304H, F316 / F316L / F316Ti, F310, F309S, F317 / F317L, F321 / F321H, F347 / F347H, F904L, ASTM A351 CF3 / CF3M / CF8 / CF8M / CF8C, DIN 1.4301, 1.4306, 1.4307, 1.4311, 1.4401, 1.4404, 1.4408, 1.4409, 1.4541, 1.4571, 1.4550, 1.4435, 1.4539
Duplex Steel Threaded Flange ASTM A182 F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61, UNS S31803 / S32205
Super Duplex Steel Threaded Flange ASTM A182 F53 / F55 / F57 / F59 / F60 / F61, UNS S32750 / S32760
Carbon Steel Threaded Flange ASTM A105 / A105N, ASTM A350 LF2, ASTM A694 F52 / F56 / F60 / F65 / F70 / F80, ASTM A216 WCB, DIN 1.0460 / 1.0402 / 1.0619, Die Steel, Mild Steel
Alloy Steel Threaded Flange ASTM A182 F5 / F9 / F11 / F12 / F22 / F91, AISI 4130 / 4140
Nickel Alloy Threaded Flange Nickel 200 / 201, ASTM B564
Monel Threaded Flange Monel 400 (UNS N04400), Monel K500 (UNS N05500), ASTM B564
Inconel Threaded Flange Inconel 600 / 601 / 625 / 690 / 718 / 783 / X750, ASTM B564
Incoloy Threaded Flange Incoloy 800 / 800H / 800HT (UNS N08800), Incoloy 825 (UNS N08825), Incoloy 925, ASTM B564
Hastelloy Threaded Flange Hastelloy C276 (UNS N10276), C22 (UNS N06022), C4, C2000, B2, B3, X, ASTM B564
Alloy 20 Threaded Flange Alloy 20 / 20Cb-3, Carpenter® 20, ASTM B462
254 SMO Threaded Flange SMO 254 / 6Mo, UNS S31254, DIN 1.4547, ASTM A182
Copper Nickel Threaded Flange Copper Nickel 90/10 (C70600), 70/30 (C71500), UNS C71640, ASTM B61 / B62 / B151 / B152
Copper Threaded Flange TP1, TP2, T1, T2, C10100–C12300, C14200–C17200, C21000–C71520, including C10930, C11000, C11400, C12000, C12200, C26000, C28000, C33000, C44300, C70600, etc.
Brass Threaded Flange Grades 3602, 2604, H59, H62, etc.
Aluminium Threaded Flange Aluminium Grades 5052, 6061, 6063, 2017, 7075, etc.
Titanium Threaded Flange ASTM B381 Gr.1 / Gr.2 / Gr.4 / Gr.5 / Gr.7, UNS R50250 / R50400 / R50550 / R50700 / R52400 / R53400 / R56320 / R56400
Other Special Grades Al6XN, Tin Bronze, Aluminium Bronze, Lead Bronze, Nimonic 75 / 80A / 90

International Flange Standards We Manufacture & Supply

Are Threaded Flanges Covered Under ASME B16.47 Series A or B Standards?

No, threaded flanges are not covered under ASME B16.47 Series A or B.

ASME B16.47 specifically applies to large-diameter flanges ranging from NPS 26” to 60”, and includes only two types: Weld Neck (WN) and Blind (BL) flanges. These standards are meant for high-pressure, large-diameter piping systems often found in oil & gas, petrochemical, and power generation industries.

Threaded flanges, on the other hand, are designed for smaller pipe sizes (½″ to 4″) and are governed by ASME B16.5. They are used primarily in systems where welding is not feasible — such as flammable, explosive, or high-pressure systems, allowing connections without welding.

For this reason, if you're sourcing or specifying threaded flanges, refer to ASME B16.5 or EN 1092-1, not ASME B16.47.

What Are the Typical Applications of Threaded Flanges in Industrial Piping Systems?

Threaded flanges are primarily used in low-pressure, non-cyclic applications where welding is either not possible or not recommended.

These flanges are ideal for flammable, hazardous, and high-temperature environments because they eliminate the need for welding — which can ignite volatile substances. Threaded connections allow for easy assembly and disassembly, making them ideal for:

  1. Petroleum and gas systems where explosive gases are present
  2. Chemical processing pipelines with reactive substances
  3. Steam lines with moderate pressure and temperature
  4. Fire protection and sprinkler systems
  5. Marine and offshore platforms, especially for quick repairs

Threaded flanges offer convenience in maintenance and are often chosen when the piping system needs to be frequently dismantled or modified without compromising safety.

Are Threaded Flanges Suitable for Underground or Buried Piping Systems?

Threaded flanges can be used in underground or buried piping systems, but with limitations and specific considerations:

  • Corrosion Protection: Since buried conditions expose flanges to moisture and chemicals, coatings like epoxy, galvanization, or wrapping are essential to prevent external corrosion.
  • Sealing Concerns: Threaded joints can loosen over time due to thermal expansion or soil movement. Using thread sealants or PTFE tape is mandatory, but not always sufficient for high-reliability systems.
  • Access Requirements: Unlike welded flanges, threaded flanges are easier to assemble or disassemble, making them suitable for locations that may need future maintenance access.

Best Practice: In critical underground systems, especially those handling hazardous or high-pressure media, welded flanges or other robust joint types are typically preferred over threaded connections due to their superior sealing reliability.

Can Threaded Flanges Be Used in High-Temperature or Cryogenic Applications?

Yes, but only under specific conditions and material compatibility.

Threaded flanges (also known as screwed flanges) are generally preferred for low-pressure and non-cyclic services, but they can be used in high-temperature or even cryogenic environments if:

  1. The material grade is suited to the temperature range (e.g., Stainless Steel 304/316 for high-temp, Inconel or Monel for cryogenic).
  2. Proper thread engagement and sealing method (like PTFE tape or sealant) are applied to prevent leaks.
  3. There is no excessive vibration or thermal expansion, which could damage the threads.

For extreme temperatures or pressure fluctuations, weld neck or socket weld flanges are typically recommended due to their better mechanical strength.

How do Threaded Flanges compare to Socket Weld and Weld Neck Flanges in terms of installation and performance?

Threaded flanges stand out for their ease of installation, especially in systems where welding is not feasible or allowed, such as flammable or hazardous environments. Unlike Socket Weld and Weld Neck Flanges, threaded flanges do not require welding — the pipe is simply screwed into the flange using a tapered thread (typically NPT or BSP).

In terms of performance:

  • Threaded flanges are ideal for low-pressure and non-cyclic systems, where quick disassembly is needed.
  • Socket Weld flanges offer a stronger connection for small-bore high-pressure pipelines, requiring a fillet weld.
  • Weld Neck flanges, with their tapered hub and butt-welded design, are best suited for high-pressure, high-temperature, and critical stress applications.

Each flange type serves a distinct purpose, and the choice depends on pressure rating, piping environment, and maintenance requirements.

How does thread type (NPT vs BSP) affect the compatibility of threaded flanges?

Threaded flanges are manufactured with different thread standards, most commonly NPT (National Pipe Thread) and BSP (British Standard Pipe). The thread type directly affects compatibility with the connected pipe:

  • NPT Threads (used in the USA and ANSI systems): Feature a tapered design that provides a tight seal through thread interference. Commonly used with ASME B1.20.1 specifications.
  • BSP Threads (used in Europe, Asia, and Middle Eastern countries): Available in two variations – BSPT (tapered) and BSPP (parallel). BSPT is more similar to NPT, but not interchangeable due to different thread angles and pitch.

Why it matters:
Using the wrong thread standard can lead to leaks, mechanical failure, or unsafe connections. Always verify that both the pipe and flange have matching thread types and standards before installation.

Which countries does Nutech Overseas export threaded flanges to?

Nutech Overseas is a globally recognized manufacturer and exporter of high-quality threaded flanges, delivering to clients across multiple continents. We specialize in supplying threaded flanges in Stainless Steel, Carbon Steel, Alloy Steel, Duplex, Super Duplex, and Nickel Alloys, tailored to meet international standards.

Our key export destinations include:

  • United States – Supplying to oil & gas, refineries, and pressure equipment fabricators.
  • Europe – Including Germany, France, Italy, Spain, and Eastern European countries.
  • Middle East – UAE, Saudi Arabia, Qatar, Oman, and Kuwait, for petrochemical and offshore platforms.

With on-time delivery, competitive pricing, and adherence to ASME, EN, DIN, and ISO standards, we have built a strong global footprint. Custom markings, third-party inspections (TPI), and country-specific documentation are also provided based on client needs.

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