Tongue & Groove Flanges | ASME B16.5 | Matched Facing

PM Industries manufactures, supplies, and stocks Tongue and Groove Flanges in a range of materials, pressure classes, and pipe sizes. A tongue and groove flange pair consists of two mating flanges with complementary face profiles: one flange has a raised concentric ring (the tongue) machined into its face, and the mating flange has a matching recessed groove machined to accept the tongue. The gasket sits in the groove, retained on its inner and outer edges by the groove walls and the tongue. When the flanges are bolted together, the tongue enters the groove and compresses the gasket in a controlled, confined seating area.

That confined gasket seating is what distinguishes tongue and groove flanges from raised face and flat face configurations. On a raised face flange, the gasket sits on an open raised surface and can be displaced inward by bolt load or lateral movement during assembly. On a tongue and groove joint, the gasket can't move. It's positionally fixed in the groove before the bolts go in, and the tongue prevents outward displacement under compression. That physical constraint produces more consistent gasket seating and better sealing reliability, particularly in applications where gasket positioning during assembly is difficult or where vibration in service could cause gasket migration.

Gasket containment under compression is the practical sealing advantage. When a gasket is compressed between two raised faces, the gasket material flows both inward and outward under bolt load, and the outer portion that isn't under the bolt circle contact area may lift slightly. In a tongue and groove joint, the groove walls contain the gasket material and the tongue prevents outward flow, keeping the full compressed thickness of the gasket under controlled seating stress. The result is a more effective seal at equivalent bolt load compared to a raised face joint.

Thermal cycling service is one of the conditions where tongue and groove flanges consistently outperform simpler face configurations. As a system heats and cools in service, flange faces move relative to each other due to differential thermal expansion. On a raised face joint, that movement can allow the gasket to work slightly, reducing the contact stress and eventually leading to a slow leak. The tongue and groove profile maintains gasket position through thermal cycling better, because the gasket has nowhere to migrate within the groove.

Non-interchangeability is the design constraint that must be managed at procurement. A tongue flange can only mate with a groove flange. A raised face flange cannot mate with a tongue or groove flange without machining modification. In plant maintenance situations where replacement flanges need to be sourced quickly, confirming the face type of the mating flange before ordering replacement components is essential to avoid delays.

Tongue and groove flanges are available with full material certification to ASTM, ASME, and applicable specifications. Both tongue and groove components must be ordered as matched pairs from the same standard and dimensional specification. Contact PM Industries for material selection, face configuration, pressure class, pipe size, and pricing.

Specification Tongue Groove Flange

Standards	ANSI/ASME B16.5, B16.48, GOST, DIN, EN-1092, B16.47 Series A & B, AWWA, BS Flanges
JIS Standard	5K, 10K, 16K, 20K, 30K, 40K, 63K
DIN Flanges	DIN 2527, 2627, 2631, 2656, 2576, 2673, 2629, 2628, 2566

Flanges are Available in Following Materials

Stainless Steel	SS 201, SS 202, SS 301, SS 304, SS 304L, SS 310, SS 310S, SS 316L, SS 316TI, SS 317, SS 317L, SS 321, SS 347, SS 409, SS 409M, SS 409L, SS 410, SS 410S, SS 420, SS 430, SS 431, SS 441, SS 444, SS 446, SS 17-4PH, SS 904L.
Duplex Steel	UNS S32205, UNS S31803 Flange
Super Duplex Steel	UNS S32750, UNS S32760 Flanges
Carbon Steel	Carbon steel A105 Flanges, A36 Flanges, IS 2062 Flanges, A350 LF2 Flanges, F42 Flanges, F52 Flanges, F56 Flanges, F60 Flanges, F65 Flanges, F70 Flanges, F80 Flanges, IBR flanges, A694 Flanges, SS400, SF440, ST37-2 Flanges, S235JrG2 Flanges, P250GH Flanges, C22.8 Flanges, etc.
Alloys Steel	Alloy 20, F1, F5, F9, F11, F22, F91 Flanges
Copper Alloys	Cu-Ni 70/30, Cu-Ni 90/10, C 24000, C 75700, C 51100, C 22000, C 27200, C 21000, C 26800, C 52100, C 77000, C 52000, C 11000, C 74500, C 23000, C 28000, C 12200, C 76400, C 51900, C 75400, C 26000, C 51000, C 10200, C 27000
Nickel Alloys	Nickel 200, 201
Inconel	Inconel 600, 601, 625, 718, 800, 825, X-750
Monel	Monel 400, k500
Hastelloy	Hastelloy C-22, C-276, C-4, X
Titanium	Grade 1, 4, 5(Ti 6Al-4V), 6(Ti 5Al-2.5Sn), 7, 11, 6Al-2Sn-4Zr-2Mo, Grade 12, 6Al-6V-25n, Grade 23(Ti 6AL-4V ELI), 8Ai-1Mo-1V, Grade 5 ELI, Grade 9(3Al-2.5V), 6Al-7Nb.
Aluminium	6063, 1100, 6082 A96082, 1050, 2017, 2024 A92024, 7050 A97050, 5083 A95083, 2014A A92014, 2011 A92011, 6061 A96061 A86061, 5754, 7085, 2050, 7071 7020, 7178, 5052 A95052, 7150, 7075 A97075 A87075, 7575, 2219, 7175
Pressure Rating	Class 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS
Types	Threaded, Plate, Screwed, Forged.
Supporting material	Gasket, Ring Joint, Flange Bolts
Size range	1/2" (15 NB) to 48" (1200NB) DN10~DN5000
High Temperature	Above 200°C (400°F) For Class 150 Or Above 400°C (750°F)
Low Temperature	Above -29 Degree C (−20°F)
Production technique	Forged, machined and Heat treated
Custom design	As per your drawing
Origin	Indian / USA / Korean / West Europe / Japan
Pressure Class	PN 6 TO PN 100
Coating/Surface Treatment:	Zinc Plated, Anti-rust Paint, Oil Black Paint, Yellow Transparent, Cold and Hot Dip Galvanized.
European/African/Russian Standard Flanges	Available
Test	Direct-reading Spectrograph, X-ray detector, UItrasonic flaw detector, Magnetic particle detector, Hydrostatic testing machine.
Marking Standard	Name of Manufacturer
	Schedule
	Type of Flange Facing
	Pressure Class
	Nominal Pipe Size, etc
Test Certificates	EN 10204/3.1B, NACE MR0103, NACE MR0175
	Raw Materials Certificate
	100% Radiography Test Report
	Third Party Inspection Report, etc

Tongue Groove Flange Dimensions

DN	d1	d2	d3	d4	d5	d6	d7	d8	f1	f2
¾"	1,69 (42,9)	1,75 (44,5)	1,69 (42,9)	1,75 (44,5)	1,31 (33,3)	1,25 (31,8)	2,12 (53,8)	2,06 (52,3)	0,25 (6,4)	0,19 (4,8)
1½"	2,88 (73,2)	2,94 (74,7)	2,50 (63,5)	2,56 (65,0)	2,12 (53,8)	2,06 (52,3)	3,31 (84,1)	2,88 (73,2)	0,25 (6,4)	0,19 (4,8)
1"	2,00 (50,8)	2,06 (52,3)	1,88 (47,7)	1,94 (49,3)	1,50 (38,1)	1,44 (36,6)	2,44 (62,0)	2,25 (57,2)	0,25 (6,4)	0,19 (4,8)
½"	1,38 (35,1)	1,44 (36,6)	1,38 (35,1)	1,44 (36,6)	1,00 (25,4)	0,94 (23,9)	1,81 (46,0)	1,75 (44,5)	0,25 (6,4)	0,19 (4,8)
1¼"	2,50 (63,5)	2,56 (65,0)	2,25 (57,2)	2,31 (58,7)	1,88 (47,8)	1,81 (46,0)	2,94 (74,7)	2,62 (66,6)	0,25 (6,4)	0,19 (4,8)
2"	3,62 (92,0)	3,69 (93,7)	3,25 (82,6)	3,31 (84,1)	2,88 (73,0)	2,81 (71,4)	4,06 (103,1)	3,62 (92,0)	0,25 (6,4)	0,19 (4,8)
4"	6,19 (157,2)	6,25 (158,8)	5,69 (144,5)	5,75 (146,1)	5,19 (131,8)	5,12 (130,0)	6,62 (168,1)	6,19 (157,2)	0,25 (6,4)	0,19 (4,8)
2½"	4,12 (104,6)	4,19 (106,4)	3,75 (95,2)	3,81 (96,8)	3,38 (85,8)	3,31 (84,1)	4,56 (115,8)	4,12 (104,6)	0,25 (6,4)	0,19 (4,8)
3"	5,00 (127,0)	5,06 (128,5)	4,62 (117,5)	4,69 (119,1)	4,25 (108,0)	4,19 (106,4)	5,44 (138,2)	5,00 (127,0)	0,25 (6,4)	0,19 (4,8)
5"	7,31 (185,7)	7,38 (187,5)	6,81 (173,0)	6,88 (174,8)	6,31 (160,3)	6,25 (158,8)	7,75 (196,9)	7,31 (185,7)	0,25 (6,4)	0,19 (4,8)
6"	8,50 (215,9)	8,56 (217,5)	8,00 (203,2)	8,06 (204,7)	7,50 (190,5)	7,44 (189,0)	8,94 (227,0)	8,50 (215,9)	0,25 (6,4)	0,19 (4,8)
8"	10,62 (269,8)	10,69 (271,5)	10,00 (254,0)	10,06 (255,5)	9,38 (238,3)	9,31 (236,5)	11,06 (281,0)	10,62 (269,8)	0,25 (6,4)	0,19 (4,8)
12"	15,00 (381,0)	15,06 (382,5)	14,25 (362,0)	14,31 (363,5)	13,50 (342,9)	13,44 (341,4)	15,44 (392,2)	15,00 (381,0)	0,25 (6,4)	0,19 (4,8)
14"	16,25 (412,8)	16,31 (414,3)	15,50 (393,7)	15,56 (395,2)	14,75 (374,7)	14,69 (373,1)	16,69 (423,9)	16,25 (412,8)	0,25 (6,4)	0,19 (4,8)
10"	12,75 (323,5)	12,81 (325,4)	12,00 (304,8)	12,06 (306,3)	11,25 (285,8)	11,19 (284,2)	13,19 (335,0)	12,75 (323,5)	0,25 (6,4)	0,19 (4,8)
16"	18,50 (469,9)	18,56 (471,5)	17,62 (447,6)	17,69 (449,3)	16,75 (425,5)	16,69 (423,9)	18,94 (481,0)	18,50 (469,9)	0,25 (6,4)	0,19 (4,8)
20"	23,00 (584,2)	23,06 (585,8)	22,00 (558,8)	22,06 (560,3)	21,00 (533,4)	20,94 (531,9)	23,44 (595,4)	23,00 (584,2)	0,25 (6,4)	0,19 (4,8)
24"	27,25 (692,2)	27,31 (693,7)	26,25 (666,8)	26,31 (668,3)	25,25 (641,4)	25,19 (639,8)	27,69 (703,3)	27,25 (692,2)	0,25 (6,4)	0,19 (4,8)
18"	21,00 (533,4)	21,06 (535,0)	20,12 (511,0)	20,19 (512,8)	19,25 (489,0)	19,19 (487,4)	21,44 (544,6)	21,00 (533,4)	0,25 (6,4)	0,19 (4,8)

Large Tongue And Groove Flange Dimensions

Nominal	Large Tongue	Large Tongue	Gasket	Number	Size of	Bolt Torque	Comp Force	Maximum 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.)
0.75	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
0.5	1.00	1.38	0.71	4	0.50	60	7560	42594	<300	4800	7	10000	14
1.25	1.88	2.50	2.13	4	0.50	60	7560	14186	<300	4800	20	10000	42
3.5	4.75	5.50	6.03	8	0.63	120	12120	16067	<300	4800	36	10000	75
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
1.5	2.12	2.88	2.98	4	0.50	60	7560	10137	<300	4800	28	10000	59
3	4.25	5.00	5.45	4	0.63	120	12120	8902	<300	4800	65	8902	120
8	9.38	10.62	19.47	8	0.75	200	18120	7446	<300	4800	129	7446	200
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
24	25.25	27.25	82.43	20	1.25	1000	55740	13525	<300	4800	355	13525	1000
10	11.25	12.75	28.26	12	0.88	320	25140	10675	<300	4800	144	10675	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
12	13.50	15.00	33.56	12	0.88	320	25140	8990	<300	4800	171	8990	320
20	21.00	23.00	69.08	20	1.13	710	43680	12646	<300	4800	269	12646	710

Ansi Tongue And Groove Flange Dimensions

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.)
2	2.88	3.62	3.78	8	0.63	120	12120	25679	<800	6400	46	10000	47
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
0.5	1.00	1.38	0.71	4	0.50	60	7560	42594	<800	6200	12	10000	14
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
2.5	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
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
5	6.31	7.31	10.69	8	0.75	200	18120	13558	<800	6400	156	10000	148
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
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
18	19.25	21.00	55.29	24	1.25	1000	55740	24194	<800	6400	439	15000	620

Groove & Tongue Flange Schedule Chart

Nominal Pipe Size Inches	DN MM	Flange Outer Diameter A MM	Flange Thickness D MM	Slip On Flange Weight in KG	Weld Neck Flange Weight in KG	Blind Flange Weight in KG
1/ 2	15	88.9	11.2	0.4	0.5	0.4
1	25	108	14.2	0.8	1	0.9
1 1/ 4	32	117.3	15.7	1	1.3	1.2
1 1/ 2	40	127	17.5	1.3	1.7	1.5
3/ 4	20	98.6	12.7	0.6	0.7	0.6
2	50	152.4	19.1	2.1	2.6	2.4
2 1/ 2	65	177.8	22.4	3.3	4.1	3.9
24	600	812.8	47.8	86.9	115	185.0
3 1/ 2	90	215.9	23.9	4.8	6.1	6.2
4	100	228.6	23.9	5.3	6.8	7.0
5	125	254	23.9	6.1	8.6	8.6
3	80	190.5	23.9	3.9	4.9	4.9
6	150	279.4	25.4	7.5	10.6	11.3
8	200	342.9	28.4	12.1	17.6	19.6
12	300	482.6	31.8	26.2	36.5	43.2
14	350	533.4	35.1	34.6	48.4	58.1
16	400	596.9	36.6	44.8	60.6	76.1
10	250	406.4	30.2	16.5	24	28.6
18	450	635	39.6	48.9	68.3	93.7
20	500	698.5	42.9	61.9	84.5	122.0

Large Tongue Flange Pressure rating

Temperature (F°)	150 LB	300 LB	400 LB	600 LB	900 LB	1500 LB	2500 LB
-20 to 100	285	740	985	1480	2220	3705	6170
600	140	570	755	1135	1705	2840	4730
800	80	410	550	825	1235	2055	3430
300	230	655	870	1310	1965	3270	5450
400	200	635	845	1265	1900	3170	5280
500	170	605	805	1205	1810	3015	5025
650	125	550	730	1100	1650	2745	4575
1000	20	85	115	170	255	430	715
200	260	680	905	1360	2035	3395	5655
700	110	530	710	1060	1590	2655	4425
750	95	505	675	1015	1520	2535	4230
850	65	320	425	640	955	1595	2655
900	50	230	305	460	690	1150	1915
950	35	135	185	275	410	685	1145