ASME B16.5 Screwed Flange
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.
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.
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 |
Material Category | Screwed Flange Grades |
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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 |
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.
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:
Threaded flanges offer convenience in maintenance and are often chosen when the piping system needs to be frequently dismantled or modified without compromising safety.
Threaded flanges can be used in underground or buried piping systems, but with limitations and specific considerations:
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.
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:
For extreme temperatures or pressure fluctuations, weld neck or socket weld flanges are typically recommended due to their better mechanical strength.
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:
Each flange type serves a distinct purpose, and the choice depends on pressure rating, piping environment, and maintenance requirements.
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:
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.
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:
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.