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Tongue and Groove Flanges

T&G Flange : Specifications | Materials | Types | Dimensions | Weight Chart | Tolerances | FAQ

Leading Manufacturer & Exporter of ASME B16.5 Tongue and Groove Flanges – Available in Carbon Steel, Stainless Steel, Alloy Steel, and Nickel Alloys. Sizes ½”–24”, Pressure Classes 150#–2500#. Serving Worldwide Clients in UAE, Australia, UK, Mexico, and India.

Exporter of ASME B16.5 Tongue and Groove Flange

Best Export Prices: sales@midlandforgefittings.com

Midland Forge and Fittings Pvt. Ltd is a trusted manufacturer and exporter of high-quality ASME B16.5 Tongue and Groove Flanges. Designed for superior performance in high-pressure piping systems, our flanges are available in Carbon, SS, Alloy Steel, and Nickel Alloys. We offer a wide range of sizes from ½” to 24” and pressure classes from 150# to 2500#, ensuring a precise fit for industrial applications in oil & gas, petrochemical, power, and chemical industries.

With a commitment to excellence, We delivers T and G Flanges worldwide, serving clients in countries including USA, UAE, Spain, Turkey, Canada, and more. Each flange is manufactured in compliance with ANSI/ASME standards, ensuring reliability, durability, and leak-proof sealing. 

A Tongue and Groove Flange is a type of flange connection designed for precise alignment and secure sealing. One flange has a raised protruding ridge called the tongue, while the mating flange has a corresponding recessed area known as the groove. The tongue fits into the groove, creating a tight fit that prevents leakage and ensures proper gasket compression. This design allows for self-centering of the flanges during assembly, which is particularly useful in high-pressure or high-temperature piping systems.

T and G Flanges are available in Raised Face (RF), Flat Face (FF), and Ring Type Joint (RTJ) configurations. The depth and width of the groove, as well as the height of the tongue, are engineered according to ANSI/ASME B16.5 standards to handle specific pressure classes. These flanges are typically used with metallic or spiral-wound gaskets, where the groove acts as a reservoir to improve sealing efficiency and prevent blowouts. The design also helps distribute bolt stress evenly across the flange, enhancing durability and reliability under cyclic loads.

ASME B16.5 T&G Flange

Tongue and Groove Pipe Flange Specifications

Size Range

15mm ( 1/2" NPS ) up to 600mm ( 24" NPS ), For 2500# in sizes from NPS 1/2 to NPS 12

Pressure Rating - Class

150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS

Marking

Grade / Material, Size (NPS or DN), Pressure Class (PN), Heat No, Standard, Manufacturer’s Name or Trademark

Face Type / Flange Connection Type

Flat Face (FF), Raise Face (RF), Ring Joint (RJT), Tongue and Groove (T&G), Male and Female (M&F)

Flange Form

Tongue and Groove

Manufacturing Standards

ASTM (A105, A182, A350, A694, B564), ASME/ANSI, MSS-SP-44, API 6A.

Materials

Stainless Steel, Carbon Steel, Alloy Steel, Duplex Steel, Super Duplex, Nickel, Inconel, Incoloy, Hastelloy, Monel, Alloy 20, 254 SMO, Copper Nickel, Titanium.

Test Certificates

EN 10204/3.1B, Raw Materials Certificate, 100% Radiography Test Report, Third Party Inspection Report, etc

Dimensional Standards

ANSI B16.5, ANSI B16.47, ANSI B16.36, ANSI B16.48, BS 4504, EN1092, UNI 2277/2278, DIN, JIS, SABS1123, GOST-12820

Testing

Direct-reading Spectrograph, Hydrostatic testing machine, X-ray detector, UI trasonic flaw detector, Magnetic particle detector

Flange Coating/Surface Treatment

Anti-rust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Cold and Hot Dip Galvanized

Production technique

Forged, Heat treated and machined
ASME B16.47, MSS SP - 44 T&G Flange

Tongue and Groove Flange – Materials, Grades & Standards

Material Category Standards / Grades (ASTM / ASME) Pressure Class / Size Range Typical Use / Application
Stainless Steel ASTM A182 F304 / F304L / F304H Class 150 – 2500, Size ½”–48” General purpose, corrosion-resistant piping
ASTM A182 F316 / F316L / F316H Class 150 – 2500, Size ½”–48” Chemical, marine, food & pharma industries
ASTM A182 F321 / F321H Class 150 – 1500, Size ½”–24” High temperature, stabilized service
Carbon Steel ASTM A105 (Forged CS) Class 150 – 2500, Size ½”–48” Pressure piping, oil & gas, general industries
ASTM A350 LF2 (Low Temp CS) Class 150 – 1500, Size ½”–24” Cryogenic & low temperature applications
Alloy Steel ASTM A182 F11 / F22 (Cr-Mo) Class 150 – 2500, Size ½”–24” Power plants, refineries, steam pipelines
ASTM A182 F91 Class 150 – 2500, Size ½”–24” High-temperature, power generation
Duplex / Super Duplex ASTM A182 F51 / F53 / F55 / F60 (UNS S31803 / S32205 / S32750 / S32760) Class 150 – 2500, Size ½”–24” Offshore, seawater, high corrosion service
Nickel Alloys ASTM B564 Inconel 600 / 625 / 718 Class 150 – 2500, Size ½”–24” Heat exchangers, chemical, aerospace
ASTM B564 Monel 400 / K500 Class 150 – 2500, Size ½”–24” Marine, seawater handling, pumps
Copper Nickel ASTM B151 / B467 (Cu-Ni 90/10, 70/30) Class 150 – 600, Size ½”–24” Shipbuilding, desalination, seawater systems
Titanium ASTM B381 Gr. 2 / Gr. 5 Class 150 – 600, Size ½”–12” Aerospace, seawater, lightweight piping
Aluminium ASTM B247 6061 / 5083 Class 150 – 300, Size ½”–12” Lightweight, non-corrosive, low-pressure piping
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ANSI/ASME B16.5 Class 150 Tongue and Groove Flange – Dimensions & Sizes in mm

Dimensions of ANSI/ASME B16.5 Tongue and Groove Flanges
Nominal Large Tongue Large Tongue Gasket Number Size of Bolt Torque Comp Force Max. Gasket Internal Min. Rec’d Min. Rec’d Max. Rec’d/Avail. Preferred
Pipe Size Contact I.D. Contact O.D. Contact Area Of Bolts at 60ksi Stress Per Bolt @ 60ksi Stress Avail. Pressure Gasket Stress Torque/Bolt Gasket Stress Torque/Bolt
(in) (in) (in) (sq.in.) Bolts (in) (ft.lbs.) (psi) (psi) (psig) (psi) (ft.lbs.) (psi) (ft.lbs.)
0.5 1.00 1.38 0.71 4 0.50 60 7560 42594 <300 4800 7 10000 14
0.75 1.31 1.69 0.89 4 0.50 60 7560 33791 <300 4800 9 10000 18
1 1.50 2.00 1.37 4 0.50 60 7560 22013 <300 4800 13 10000 27
1.25 1.88 2.50 2.13 4 0.50 60 7560 14186 <300 4800 20 10000 42
1.5 2.12 2.88 2.98 4 0.50 60 7560 10137 <300 4800 28 10000 59
2 2.88 3.62 3.78 4 0.63 120 12120 12839 <300 4800 45 10000 93
2.5 3.38 4.12 4.36 4 0.63 120 12120 11128 <300 4800 52 10000 108
3 4.25 5.00 5.45 4 0.63 120 12120 8902 <300 4800 65 8902 120
3.5 4.75 5.50 6.03 8 0.63 120 12120 16067 <300 4800 36 10000 75
4 5.19 6.19 8.93 8 0.63 120 12120 10854 <300 4800 53 10854 120
5 6.31 7.31 10.69 8 0.75 200 18120 13558 <300 4800 71 13558 200
6 7.50 8.50 12.56 8 0.75 200 18120 11541 <300 4800 83 11541 200
8 9.38 10.62 19.47 8 0.75 200 18120 7446 <300 4800 129 7446 200
10 11.25 12.75 28.26 12 0.88 320 25140 10675 <300 4800 144 10675 320
12 13.50 15.00 33.56 12 0.88 320 25140 8990 <300 4800 171 8990 320
14 14.75 16.25 36.50 12 1.00 490 33060 10868 <300 4800 216 10868 490
16 16.75 18.50 48.42 16 1.00 490 33060 10923 <300 4800 215 10923 490
18 19.25 21.00 55.29 16 1.13 710 43680 12639 <300 4800 270 12639 710
20 21.00 23.00 69.08 20 1.13 710 43680 12646 <300 4800 269 12646 710
24 25.25 27.25 82.43 20 1.25 1000 55740 13525 <300 4800 355 13525 1000

ANSI/ASME B16.5 Class 300 Tongue and Groove Flange – Dimensions & Sizes in mm

Nominal Large Tongue Large Tongue Gasket Number Size of Bolt Torque Comp Force Max. Gasket Internal Min. Rec’d Min. Rec’d Max. Rec’d/Avail. Preferred
Pipe Size Contact I.D. Contact O.D. Contact Area Of Bolts at 60ksi Stress Per Bolt @ 60ksi Stress Avail. Pressure Gasket Stress Torque/Bolt Gasket Stress Torque/Bolt
(in) (in) (in) (sq.in.) Bolts (in) (ft.lbs.) (psi) (psi) (psig) (psi) (ft.lbs.) (psi) (ft.lbs.)
0.5 1.00 1.38 0.71 4 0.50 60 7560 42594 <800 6200 12 10000 14
0.75 1.31 1.69 0.89 4 0.63 120 12120 54174 <800 6200 21 10000 22
1 1.50 2.00 1.37 4 0.63 120 12120 35290 <800 6400 28 10000 34
1.25 1.88 2.50 2.13 4 0.63 120 12120 22742 <800 6400 43 10000 53
1.5 2.12 2.88 2.98 4 0.75 200 18120 24298 <800 6400 64 10000 82
2 2.88 3.62 3.78 8 0.63 120 12120 25679 <800 6400 46 10000 47
2.5 3.38 4.12 4.36 8 0.75 200 18120 33273 <800 6400 60 10000 60
3 4.25 5.00 5.45 8 0.75 200 18120 26618 <800 6400 88 10000 75
3.5 4.75 5.50 6.03 8 0.75 200 18120 24021 <800 6400 99 10000 83
4 5.19 6.19 8.93 8 0.75 200 18120 16227 <800 6400 125 10000 123
5 6.31 7.31 10.69 8 0.75 200 18120 13558 <800 6400 156 10000 148
6 7.50 8.50 12.56 12 0.75 200 18120 17312 <800 6400 131 10000 116
8 9.38 10.62 19.47 12 0.88 320 25140 15496 <800 6400 205 10000 207
10 11.25 12.75 28.26 16 1.00 490 33060 18718 <800 6400 219 10000 262
12 13.50 15.00 33.56 16 1.13 710 43680 20826 <800 6400 319 15000 511
14 14.75 16.25 36.50 20 1.13 710 43680 23933 <800 6600 287 15000 445
16 16.75 18.50 48.42 20 1.25 1000 55740 23021 <800 6600 401 15000 652
18 19.25 21.00 55.29 24 1.25 1000 55740 24194 <800 6400 439 15000 620
20 21.00 23.00 69.08 24 1.25 1000 55740 19365 <800 6400 484 15000 775
24 25.25 27.25 82.43 24 1.50 1600 84300 24546 <800 6400 662 15000 978

Tongue and Groove Piping Flange Weight Chart (lbs) – Pressure Class 150 to 2500

Nominal Pipe Size (in) Class 150# Class 300# Class 600# Class 900# Class 1500# Class 2500#
½ 2.5 lbs 3.2 lbs 5.1 lbs 6.2 lbs 10 lbs 15 lbs
¾ 3.0 lbs 4.0 lbs 6.5 lbs 7.8 lbs 12 lbs 18 lbs
1 4.5 lbs 5.8 lbs 9.0 lbs 11 lbs 16 lbs 25 lbs
1¼ 6.2 lbs 8.0 lbs 12 lbs 15 lbs 21 lbs 32 lbs
1½ 8.0 lbs 10 lbs 15 lbs 18 lbs 26 lbs 38 lbs
2 12 lbs 15 lbs 23 lbs 28 lbs 40 lbs 60 lbs
2½ 16 lbs 20 lbs 30 lbs 37 lbs 52 lbs 78 lbs
3 20 lbs 26 lbs 40 lbs 50 lbs 68 lbs 100 lbs
4 35 lbs 45 lbs 70 lbs 90 lbs 120 lbs 180 lbs
6 60 lbs 80 lbs 125 lbs 160 lbs 210 lbs 300 lbs
8 95 lbs 125 lbs 200 lbs 260 lbs 320 lbs 450 lbs
10 150 lbs 200 lbs 320 lbs 420 lbs 520 lbs 750 lbs
12 200 lbs 280 lbs 450 lbs 580 lbs 720 lbs 1050 lbs
14 250 lbs 350 lbs 560 lbs 720 lbs 900 lbs 1300 lbs
16 320 lbs 450 lbs 720 lbs 920 lbs 1150 lbs 1650 lbs
18 400 lbs 580 lbs 900 lbs 1150 lbs 1400 lbs 2000 lbs
20 480 lbs 680 lbs 1050 lbs 1350 lbs 1650 lbs 2400 lbs
24 650 lbs 900 lbs 1400 lbs 1800 lbs 2200 lbs 3200 lbs

Tongue and Groove Flange Tolerances as per ANSI / ASME B16.5, B16.47

Feature Tolerance Reference
Outside Diameter (OD) ±1/16” (1.6 mm) B16.5 / B16.47
Thickness of Flange (T) ±1/16” (1.6 mm) B16.5 / B16.47
Bolt Circle Diameter (PCD) ±1/32” (0.8 mm) B16.5 / B16.47
Bolt Hole Diameter +1/64” / -0 B16.5 / B16.47
Raised Face (RF) Height ±1/32” (0.8 mm) B16.5 / B16.47
Ring-Type Joint (RTJ) Groove As per API / B16.5 Depth ±0.003–0.005” depending on size
How does the tongue and groove design improve flange sealing?
  • The tongue protrudes from one flange and fits into the corresponding groove of the mating flange.
  • This design ensures self-alignment, preventing misalignment during assembly.
  • The groove acts as a reservoir for gaskets, enhancing the sealing surface area.
  • It helps maintain uniform bolt load distribution, reducing the risk of leaks under high-pressure or high-temperature conditions.
  • Spiral Wound Gaskets: Suitable for high-pressure and temperature applications.
  • Ring-Type Joint (RTJ) Gaskets: Ideal for Class 900# and above.
  • Metallic or Composite Gaskets: Used in chemical or oil & gas pipelines.
  • The gasket thickness must match the groove depth, and material must withstand the operating environment.
  • Yes, T&G flanges are compatible with:
    • Raised Face (RF): Common in general industrial and chemical piping.
    • Flat Face (FF): For cast iron or low-pressure lines.
    • Ring-Type Joint (RTJ): High-pressure, critical-service pipelines where metal-to-metal sealing is required.
  • Selection depends on pressure, temperature, and gasket type.
United Arab Emirates (UAE), Saudi Arabia, Oman, Qatar, Kuwait, Bahrain, Iraq, Jordan, Lebanon, Yemen, Iran, Israel, Germany, United Kingdom (UK), Italy, France, Spain, Netherlands, Myanmar, Singapore, Malaysia, Indonesia, Vietnam, South Korea, Philippines, Thailand, Bangladesh, Sri Lanka, Papua New Guinea, United States (USA), Canada, Brazil, Chile, Argentina, Colombia, Russia, Ukraine, Kazakhstan, Poland, Egypt, Algeria, Morocco, Tunisia, Libya, Nigeria, Ghana, Ivory Coast, Senegal, Cameroon, Gabon, Democratic Republic of Congo, Kenya, Tanzania, Uganda, Ethiopia, Rwanda, Zambia, South Africa, Mozambique, Namibia, Botswana