Tongue & Groove Flanges

T&G Flange Suppliers

Tongue & Groove Flanges Suppliers

ASME B16.5 Tongue & Groove Flanges: Dimensions | Specifications | Material Grade | Standards | About T&G Flange | All Product Types

Nutech Overseas stands as a trusted name among global Tongue & Groove Flanges suppliers, offering high-integrity forged T&G flanges that ensure superior sealing for high-pressure and high-temperature piping systems. These flanges consist of a matching pair—one with a raised tongue face and the other with a matching groove face—ensuring accurate gasket alignment and preventing lateral movement during installation.

Commonly used in pressure vessels, heat exchangers, chemical reactors, and critical fluid transport systems, Tongue & Groove flanges are ideal where reliable, leak-proof connections are essential. The design ensures that the gasket remains centralized, enabling consistent sealing and minimal maintenance over long-term operations.

We manufacture and export a complete range of small and large tongue and groove face flanges in accordance with ASME B16.5, ASME B16.47, MSS-SP-44, and EN 1092-1 standards. Available in Class 150 to Class 2500, and sizes ranging from ½″ NB to 60″ NB (DN15 to DN1500), our T&G flanges are supplied with Raised Face (RF), Groove Face, and Ring Type Joint (RTJ) facing options.

With strict quality control and international certifications like EN 10204 3.1/3.2, ISO 9001, PED, and NACE MR0175, Nutech ensures performance under the toughest industrial conditions. Whether used in oil & gas, power generation, petrochemical, marine, or offshore platforms, our Tongue & Groove flanges offer dimensional accuracy, corrosion resistance, and leak-free service life.

Tongue and Groove flanges available in Class 150 to 2500 and sizes ranging from ½″ NB to 60″ NB as per ASME B16.5 and B16.47.

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

Widely supplied forged T&G face flanges in stainless steel, carbon steel, duplex, and high nickel alloys for oil and gas, petrochemical, marine, and power plant applications.

Technical Specifications of Tongue & Groove Flanges

Specification Details
Type Tongue & Groove Flange (T&G), Large Tongue Groove, Small Tongue Groove
Design Standard ASME B16.5, ASME B16.47 Series A & B, DIN, EN 1092-1, ISO 7005, BS 4504
Size Range ½″ NB to 60″ NB (DN15 to DN1500)
Pressure Ratings Class 150, 300, 600, 900, 1500, 2500 (PN6 to PN400)
Face Type Tongue Face (Male) and Groove Face (Female) – designed to mate as a sealing pair
Flange Thickness As per ASME / EN / DIN dimensional specifications
Function Designed to ensure accurate alignment and leak-proof sealing in high-pressure piping systems
Surface Finish Stock finish (3.2–6.3 μm), Smooth face, Spiral Serrated, Concentric Serrated
Gasket Compatibility Metal Gaskets, PTFE, Graphite, and Spiral Wound Gaskets for T&G faces
Drilling Template Complies with ANSI B16.5 / B16.47 and EN 1092-1 bolt-hole patterns
Coating / Protection Black Paint, Yellow Transparent Varnish, Anti-Rust Oil, Hot Dip Galvanized
Testing & Inspection Hydrostatic Test, PMI, Ultrasonic/Magnetic Particle Testing, Dimensional Check, Visual Inspection
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, Power Plants, Offshore Drilling, Petrochemical, Refining, Water Treatment, Marine Engineering
Origin Made in India (by Nutech Overseas)
Export Network USA, Europe, and Middle East

Complete Material Grade Chart - Class 150 Tongue & Groove Flange

Material Category T&G Flange Grades
Stainless Steel Tongue & Groove 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 Tongue & Groove Flange ASTM A182 F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61, UNS S31803 / S32205
Super Duplex Steel Tongue & Groove Flange ASTM A182 F53 / F55 / F57 / F59 / F60 / F61, UNS S32750 / S32760
Carbon Steel Tongue & Groove 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 Tongue & Groove Flange ASTM A182 F5 / F9 / F11 / F12 / F22 / F91, AISI 4130 / 4140
Nickel Alloy Tongue & Groove Flange Nickel 200 / 201, ASTM B564
Monel Tongue & Groove Flange Monel 400 (UNS N04400), Monel K500 (UNS N05500), ASTM B564
Inconel Tongue & Groove Flange Inconel 600 / 601 / 625 / 690 / 718 / 783 / X750, ASTM B564
Incoloy Tongue & Groove Flange Incoloy 800 / 800H / 800HT (UNS N08800), Incoloy 825 (UNS N08825), Incoloy 925, ASTM B564
Hastelloy Tongue & Groove Flange Hastelloy C276 (UNS N10276), C22 (UNS N06022), C4, C2000, B2, B3, X, ASTM B564
Alloy 20 Tongue & Groove Flange Alloy 20 / 20Cb-3, Carpenter® 20, ASTM B462
254 SMO Tongue & Groove Flange SMO 254 / 6Mo, UNS S31254, DIN 1.4547, ASTM A182
Copper Nickel Tongue & Groove Flange Copper Nickel 90/10 (C70600), 70/30 (C71500), UNS C71640, ASTM B61 / B62 / B151 / B152
Copper Tongue & Groove Flange TP1, TP2, T1, T2, C10100–C12300, C14200–C17200, C21000–C71520, including C10930, C11000, C11400, C12000, C12200, C26000, C28000, C33000, C44300, C70600, etc.
Brass Tongue & Groove Flange Grades 3602, 2604, H59, H62, etc.
Aluminium Tongue & Groove Flange Aluminium Grades 5052, 6061, 6063, 2017, 7075, etc.
Titanium Tongue & Groove 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

What are Tongue and Groove Flanges and how do they work?

Tongue and Groove Flanges (T&G Flanges) are a matched pair of flanges designed with a raised ring (tongue) on one flange and a matching depression (groove) on the other. When bolted together, the tongue fits perfectly into the groove, ensuring tight alignment and a strong seal.

Key Technical Features:

  • The design minimizes gasket movement and reduces the risk of blowout.
  • Commonly used in high-pressure, high-temperature, or hazardous fluid applications.
  • They require precise machining for both mating surfaces.
  • Can be installed with metallic or semi-metallic gaskets, especially for critical services.

Where They Are Used:

  • Oil & Gas pipelines
  • Chemical and petrochemical processing
  • Offshore platforms
  • High-integrity process piping in refineries and power plants

This configuration ensures concentric alignment and offers superior sealing performance, especially in systems where leak prevention is critical.

What are the advantages of using Tongue & Groove Flanges over other flange types?

It offers several engineering and operational advantages over standard flange face types, especially in applications requiring high sealing integrity and precise alignment.

Key Advantages:

  1. Improved Sealing: The tongue fits into the groove, providing a self-aligning seal that reduces gasket displacement and leakage risk.
  2. Ideal for Hazardous Media: Perfect for systems transporting toxic, flammable, or high-pressure fluids, where sealing failure is not acceptable.
  3. Prevents Gasket Creep: The groove holds the gasket in position, reducing the chances of gasket movement during assembly or operation.
  4. Better Alignment: Mating face ensures accurate flange alignment, reducing stress on bolts and the piping system.
  5. Minimized Deformation: Less prone to warping under high temperature or pressure compared to flat face flanges.

T&G flanges are specifically chosen for critical applications where joint integrity and safety cannot be compromised.

What types of gaskets are used with Tongue and Groove Flanges?

These flanges are specifically designed to be used with gaskets that fit into the groove, providing a reliable and leak-proof seal, even in challenging environments.

Common Gasket Types:

  • Metal Jacketed Gaskets – Used for high-pressure and high-temperature applications, combining soft filler and metallic outer shell.
  • Spiral Wound Gaskets – Frequently used for the groove side; the metallic winding ensures strength, while the filler (e.g., graphite or PTFE) ensures flexibility and sealing.
  • Soft Gaskets (Compressed Fiber, PTFE, Graphite) – Used in less severe conditions where temperature and pressure are moderate.
  • Custom Machined Ring Gaskets – Sometimes used when extreme performance or material compatibility is required.

Important Note:

  • The gasket must be compatible with the groove dimensions to ensure full contact and sealing.
  • Raised face or full-face gaskets are not compatible with T&G flanges due to the mating surface mismatch.
What is the difference between Tongue & Groove Flanges and Male & Female Flanges?

Though often confused, Tongue & Groove (T&G) and Male & Female (M&F) flanges serve similar purposes but differ in their mating design and gasket positioning.

Key Differences:

  1. Contact Surface Design:
    • Tongue & Groove: One flange has a raised ring (tongue) and the other has a matching depression (groove).
    • Male & Female: One flange has a protruding male face, while the other has a recessed female face.
  2. Sealing Method:
    • T&G Flanges: Use gaskets placed within the groove, which are compressed by the tongue for a secure alignment and seal.
    • M&F Flanges: Typically use a gasket positioned over the entire male face, providing more surface contact and support.
  3. Interchangeability:
    • These flanges are not interchangeable — a T&G pair must match, and M&F flanges must pair with their correct counterpart.
  4. Applications:
    • Both are used in critical pipelines, but T&G is more common in high-sealing environments, while M&F is preferred when gasket compression strength is needed.

Understanding this difference helps in selecting the correct flange for pressure handling, sealing integrity, and flange compatibility in any piping system.

Are Tongue & Groove Flanges suitable for cyclic loading and vibration-prone systems?

Yes, Tongue & Groove Flanges are often preferred in systems where cyclic pressure, temperature fluctuations, or mechanical vibration is present — but their performance depends on specific design and installation factors.

Why T&G Flanges Perform Well in Such Environments:

  • Self-Centering Design: The interlocking tongue and groove faces provide automatic alignment, which reduces flange face movement during thermal or pressure cycles.
  • Enhanced Gasket Retention: The groove secures the gasket in place, minimizing the risk of gasket blowout or slippage under pulsating loads.
  • Leak-Resistant Joint: Even under vibration, the confinement of the gasket ensures consistent sealing force is applied, reducing the risk of micro-leakage.

Important Considerations:

  • Use vibration-resistant fasteners and follow proper torque tightening sequence.
  • Choose gaskets with recovery properties (like spiral wound with graphite filler) for better performance under cycling.
  • Ensure proper face finish and flange alignment to prevent stress concentration points.

T&G flanges are especially useful in applications like power generation, reciprocating pump stations, compressors, and offshore rigs — where durability under dynamic conditions is critical.

Which countries does Nutech Overseas export Tongue & Groove Flanges to?

We are a trusted global supplier of Tongue & Groove Flanges, exporting to more than 40 countries across major industrial markets. Our flanges are used in a wide variety of sectors including oil & gas, petrochemicals, marine, offshore platforms, and energy infrastructure.

Key Export Destinations Include:

  • Middle East: UAE, Saudi Arabia, Qatar, Oman, Kuwait, Bahrain
  • Europe: Germany, Italy, France, Spain, Netherlands, UK
  • Asia: Singapore, South Korea, Japan, Malaysia, Vietnam
  • Africa: Egypt, Nigeria, South Africa, Algeria
  • Americas: United States, Mexico, Brazil, Chile, Argentina

We support custom documentation, marking requirements, and export packaging in line with EN, ASME, and ISO standards, making us a reliable choice for international EPC contractors, OEMs, and stockists.

Our focus remains on quality, timely delivery, and global compliance, making Nutech a preferred name in forged flange exports worldwide.

Browse The Products

ASME B16.11 Forged Fittings

Forged Fittings

PDF Icon

Forged Fittings

Get More Details
ASME B16.5 Flanges

Flanges