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Carbon Steel Tongue and Groove Flanges
Carbon steel tongue and groove flanges come as a pair that only works together. One flange has a narrow ring, the tongue, standing about 1/4 inch off its face. The other has a groove cut to take that ring. The gasket is placed in the indentation, and when the tongue presses onto it, the gasket is held firmly down inside as well as outside. It has nowhere to squeeze to, which is exactly why people specify this face on exchangers and vessel covers. We make them in ASTM A105, A350 LF2 and A694 to the facing sizes in ASME B16.5. Solitaire Overseas is a Mumbai based stockist and exporter of carbon steel flanges, pipe and fittings. Each tongue and groove pair is supplied with an EN 10204 3.1 certificate traced to its heat, and third-party inspection is available on request.
Technical Data
Specifications of Carbon Steel Tongue and Groove Flanges
| Parameter | Detail |
|---|---|
|
Product |
Carbon steel tongue and groove flanges, supplied as matched pairs |
|
Dimensional standard |
ASME B16.5 (NPS 1/2" to 24"); ASME B16.47 or drawing for NPS 26" to 60" |
|
Materials |
ASTM A105, ASTM A350 LF2, ASTM A694 F52 to F70 |
|
Pressure class |
150, 300, 400, 600, 900, 1500, 2500 |
|
Flange types |
Weld neck, slip on, blind, socket weld |
|
Face |
Large or small tongue and groove |
|
Gasket face finish |
Small tongue and groove: 3.2 µm Ra (125 µin) max per B16.5 |
|
Testing |
Chemical, tensile, hardness, impact (LF2), ultrasonic on request |
|
Certification |
EN 10204 3.1; 3.2 with third party inspection on request |
Chemical Composition of Tongue and Groove Flange Grades
| Element (%) | ASTM A105 | ASTM A350 LF2 |
|---|---|---|
|
Carbon, max |
0.35 |
0.30 |
|
Manganese |
0.60 to 1.05 |
0.60 to 1.35 |
|
Phosphorus, max |
0.035 |
0.035 |
|
Sulphur, max |
0.040 |
0.040 |
|
Silicon |
0.10 to 0.35 |
0.15 to 0.30 |
|
Copper, max |
0.40 |
0.40 |
|
Nickel, max |
0.40 |
0.40 |
|
Chromium, max |
0.30 |
0.30 |
|
Molybdenum, max |
0.12 |
0.12 |
|
Vanadium, max |
0.08 |
0.08 |
|
Niobium, max |
Not specified |
0.02 |
ASTM A694 is a property based specification. Its chemistry is confirmed per heat on the mill test certificate, so no composition row is shown.
Mechanical Properties of Tongue and Groove Flanges
| Grade | Tensile strength (MPa) | Yield strength, min (MPa) | Elongation, min (%) | Hardness, max | Impact test |
|---|---|---|---|---|---|
|
ASTM A105 |
485 min |
250 |
30 |
187 HB |
Not required |
|
ASTM A350 LF2 Class 1 |
485 to 655 |
250 |
22 |
197 HB |
20 J average, 16 J single, at minus 46°C |
|
ASTM A694 F52 |
455 min |
360 |
20 |
Not specified |
By agreement |
|
ASTM A694 F60 |
515 min |
415 |
20 |
Not specified |
By agreement |
|
ASTM A694 F65 |
530 min |
450 |
20 |
Not specified |
By agreement |
|
ASTM A694 F70 |
565 min |
485 |
18 |
Not specified |
By agreement |
Tongue and Groove Flange Dimensions, ASME B16.5
On the large tongue and groove face, the tongue and groove carry both an outside and an inside diameter. State here how the small face differs, as set out in ASME B16.5, so buyers know which to quote.
| NPS | Large tongue OD, in (mm) | Small tongue OD, in (mm) | Tongue ID, in (mm) | Large groove OD, in (mm) | Small groove OD, in (mm) | Groove ID, in (mm) |
|---|---|---|---|---|---|---|
|
1/2" |
1.38 (35.0) |
1.38 (35.0) |
1.00 (25.4) |
1.44 (36.6) |
1.44 (36.6) |
0.94 (23.9) |
|
3/4" |
1.69 (42.9) |
1.69 (42.9) |
1.31 (33.3) |
1.75 (44.5) |
1.75 (44.5) |
1.25 (31.8) |
|
1" |
2.00 (50.8) |
1.88 (47.8) |
1.50 (38.1) |
2.06 (52.3) |
1.94 (49.3) |
1.44 (36.6) |
|
1 1/4" |
2.50 (63.5) |
2.25 (57.1) |
1.88 (47.8) |
2.56 (65.0) |
2.31 (58.7) |
1.81 (46.0) |
|
1 1/2" |
2.88 (73.2) |
2.50 (63.5) |
2.12 (53.8) |
2.94 (74.7) |
2.56 (65.0) |
2.06 (52.3) |
|
2" |
3.62 (91.9) |
3.25 (82.5) |
2.88 (73.2) |
3.69 (93.7) |
3.31 (84.1) |
2.81 (71.4) |
|
2 1/2" |
4.12 (104.6) |
3.75 (95.3) |
3.38 (85.8) |
4.19 (106.4) |
3.81 (96.8) |
3.31 (84.1) |
|
3" |
5.00 (127.0) |
4.62 (117.3) |
4.25 (108.0) |
5.06 (128.5) |
4.69 (119.1) |
4.19 (106.4) |
|
3 1/2" |
5.50 (139.7) |
5.12 (130.0) |
4.75 (120.7) |
5.56 (141.2) |
5.19 (131.8) |
4.69 (119.1) |
|
4" |
6.19 (157.2) |
5.69 (144.5) |
5.19 (131.8) |
6.25 (158.8) |
5.75 (146.1) |
5.12 (130.0) |
|
5" |
7.31 (185.7) |
6.81 (173.0) |
6.31 (160.3) |
7.38 (187.4) |
6.88 (174.8) |
6.25 (158.8) |
|
6" |
8.50 (215.9) |
8.00 (203.2) |
7.50 (190.5) |
8.56 (217.4) |
8.06 (204.7) |
7.44 (189.0) |
|
8" |
10.62 (269.7) |
10.00 (254.0) |
9.38 (238.3) |
10.69 (271.5) |
10.06 (255.5) |
9.31 (236.5) |
|
10" |
12.75 (323.9) |
12.00 (304.8) |
11.25 (285.8) |
12.81 (325.4) |
12.06 (306.3) |
11.19 (284.2) |
|
12" |
15.00 (381.0) |
14.25 (361.9) |
13.50 (342.9) |
15.06 (382.5) |
14.31 (363.5) |
13.44 (341.4) |
|
14" |
16.25 (412.8) |
15.50 (393.7) |
14.75 (374.6) |
16.31 (414.3) |
15.56 (395.2) |
14.69 (373.1) |
|
16" |
18.50 (469.9) |
17.62 (447.5) |
16.75 (425.4) |
18.56 (471.4) |
17.69 (449.3) |
16.69 (423.9) |
|
18" |
21.00 (533.4) |
20.12 (511.0) |
19.25 (488.9) |
21.06 (534.9) |
20.19 (512.8) |
19.19 (487.4) |
|
20" |
23.00 (584.2) |
22.00 (558.8) |
21.00 (533.4) |
23.06 (585.7) |
22.06 (560.3) |
20.94 (531.9) |
|
24" |
27.25 (692.1) |
26.25 (666.8) |
25.25 (641.4) |
27.31 (693.7) |
26.31 (668.3) |
25.19 (639.8) |
Tongue height 0.25 in (6.4 mm). Groove depth 0.19 in (4.8 mm). In Classes 400 to 2500 the 1/4 inch tongue height is in addition to the minimum flange thickness. The lap left after machining the groove must be at least the nominal pipe wall thickness. Outside diameter, bolt circle and drilling are the same as a raised face flange of the same size and class. Source: ASME B16.5 facing table.
For body dimensions and weights, use ourFlange Weight Calculator.
Application of Carbon Steel Tongue & Groove Flanges
- Oil and Gas Industry: Carbon steel tongue and groove flanges provide secure pipe connections in refineries, gas pipelines, and oil processing facilities.
- Chemical Processing Plants: The tongue and groove flange design supports reliable sealing in industrial piping systems handling compatible chemicals.
- Power Generation: An ASME B16.5 tongue and groove flange is used in steam lines, boilers, and industrial power plant piping.
- Petrochemical Industry: The tongue and groove face helps maintain proper gasket positioning in demanding process applications.
- Water Treatment Plants: Carbon steel groove and tongue flanges connect pipes, pumps, and treatment equipment.
- Industrial Piping Systems: An A105 tongue and groove flange is suitable for applications requiring durable forged carbon steel components.
Request a quote for carbon steel tongue and groove flanges
Quick enquiry: size, class, grade, quantity and delivery location.
Frequently Asked Questions
A matched flange pair where a raised ring (tongue) on one flange fits a groove in the other, trapping the gasket inside the groove.
Tongue and groove confines the gasket on both inner and outer edges. Male and female confines it on the outer edge only.
No. A tongue must mate with a groove. Order tongue and groove flanges as matched pairs.
The groove walls hold it. The outer wall prevents blowout and the inner wall keeps it out of the bore, away from the flow.
ASME B16.5 gives tongue and groove facing dimensions for NPS 1/2" to 24". Larger flanges follow ASME B16.47 or drawing.
ASTM A105 for general service, A350 LF2 for low temperature service, and A694 F52 to F70 for high yield pipelines.
NPS 1/2" to 24" to ASME B16.5, larger to order, in Class 150, 300, 600, 900, 1500 and 2500.
Size, class, flange type, large or small face, grade, which side has the tongue, gasket type, quantity and certificate required.
Talk to Solitaire Overseas
Every tongue and groove pair is fit checked before dispatch. Read ourQuality Policy, view ourCertificates, or see the full range ofCarbon Steel Flanges.