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Stainless Steel Lap Joint Flange

The main structural feature of the stainless steel lap joint flange is the loose connection. It consists of a flange body, a flange nipple and connecting bolts. The flange body and the flange nipple are loose fitting, and this structure allows the pipeline to expand and contract freely within a certain range.

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The main structural feature of the stainless steel lap joint flange is the loose connection. It consists of a flange body, a flange nipple and connecting bolts. The flange body and the flange nipple are loose fitting, and this structure allows the pipeline to expand and contract freely within a certain range.

When connecting the pipeline, the collar is put on the pipeline, and then the flange is fixed on the collar by bolts, with a sealing gasket placed in the middle. When the bolts are tightened, the flange will exert pressure on the sealing gasket, causing it to deform and fill the gap between the pipeline and the flange, thereby achieving a sealing effect and preventing medium leakage.Lap joint  flanges are suitable for the connection of non-ferrous metals such as steel and aluminum, and stainless and acid-resistant steel containers and for corrosion-resistant pipelines.

Specification of Stainless Steel Lap Joint Flanges

Size Range 1/2″ – 24” / DN15 – DN600
Pressure Rating Class 150, 300, 600, 900, 1500, 2500lb
Standard ASME B16.5, EN1092-1
Carbon Steel ASTM A105 / A105N
Low Temp Carbon Steel ASTM A350 LF2 / LF3
Pipeline Steel ASTM A694 F42 / 46 / 56 / 60 / 65
Alloy Steel ASTM A182 F11 / 12 / 5 / 9 / 91 / 92
Stainless Steel ASTM A182 F304/304L/304H, 316/316L, 310S, 317,347,904L
Duplex Stainless Steel ASTM A182 F51, F53, F44

Class 150 lb Lap Joint Flange Dimensions & Weight

NPS A B C D R F H I J W
inch inch inch inch inch inch No. of

Holes

inch inch kg/pc
mm mm mm mm mm mm mm mm
1/2 3.500 0.900 0.440 0.620 0.120 1.190 4 0.620 2.380 0.38
88.90 22.90 11.20 15.70 3.000 30.20 15.70 60.45
3/4 3.880 1.110 0.500 0.620 0.120 1.500 4 0.620 2.750 0.55
98.60 28.20 12.70 15.70 3.000 38.10 15.70 69.85
1 4.250 1.380 0.560 0.690 0.120 1.940 4 0.620 3.120 0.76
108.0 35.10 14.20 17.50 3.000 49.30 15.70 79.25
1-1/4 4.620 1.720 0.620 0.810 0.190 2.310 4 0.620 3.500 1.01
117.3 43.70 15.70 20.60 4.800 58.70 15.70 88.90
1-1/2 5.000 1.970 0.690 0.880 0.250 2.560 4 0.620 3.880 1.30
127.0 50.00 17.50 22.40 6.400 65.00 15.70 98.60
2 6.000 2.460 0.750 1.000 0.310 3.060 4 0.750 4.750 2.03
152.4 62.5 19.10 25.40 7.900 77.70 19.10 120.7
2-1/2 7.000 2.970 0.880 1.120 0.310 3.560 4 0.750 5.500 3.25
177.8 75.40 22.40 28.40 7.900 90.40 19.10 139.7
3 7.500 3.600 0.940 1.190 0.380 4.250 4 0.750 6.000 3.81
190.5 91.40 23.90 30.20 9.700 108.0 19.10 152.4
3-1/2 8.500 4.100 0.940 1.250 0.380 4.810 8 0.750 7.000 4.76
215.9 104.1 23.90 31.75 9.700 122.2 19.10 177.8
4 9.000 4.600 0.940 1.310 0.440 5.310 8 0.750 7.500 5.25
228.6 116.8 23.90 33.30 11.20 134.9 19.10 190.5
5 10.00 5.690 0.940 1.440 0.440 6.440 8 0.880 8.500 6.02
254.0 114.5 23.90 36.60 11.20 163.6 22.40 215.9
6 11.00 6.750 1.000 1.560 0.500 7.560 8 0.880 9500 7.40
279.4 171.5 25.40 39.60 12.70 192.0 22.40 241.3
8 13.50 8.750 1.120 1.750 0.500 9.690 8 0.880 11.75 12.1
342.9 222.3 28.40 44.50 12.70 246.1 22.40 298.5
10 16.00 10.92 1.190 1.940 0.500 12.00 12 1.000 14.25 16.4
406.4 277.4 30.20 49.30 12.70 304.8 25.40 362.0
12 19.00 12.92 1.250 2.190 0.500 14.38 12 1.000 17.00 26.1
482.6 328.2 31.75 55.60 12.70 365.3 25.4 431.8
14 21.00 14.18 1.380 3.120 0.500 15.75 12 1.120 18.75 34.5
533.4 360.2 35.10 79.25 12.7 400.1 28.4 476.3
16 23.5 16.19 1.440 3.440 0.500 18.00 16 1.120 21.25 44.6
296.9 411.2 36.60 87.40 12.70 457.2 284 539.8
18 25.00 18.20 1.560 3.810 0.500 19.88 16 1.250 22.75 48.7
635.0 462.3 39.60 96.80 12.70 505.0 31.75 577.9
20 27.5 20.25 1.690 4.060 0.500 22.00 20 1.125 25.00 61.6
698.5 514.4 42.90 103.1 12.70 558.8 31.75 635
24 32.00 24.25 1.880 4.380 0.500 26.12 20 1.380 29.50 86.6
812.8 616.0 47.80 111.3 12.70 663.4 35.10 749.3

Structural Composition and Characteristics of Stainless Steel lap Joint Flange

Flange: usually made of stainless steel, with good corrosion resistance and strength. Bolt holes are evenly distributed on the flange for connecting bolts. Its surface is processed to ensure good contact with the sealing gasket and the collar.
Sealing gasket: According to different media and working conditions, sealing gaskets of different materials can be selected, such as rubber, asbestos, etc. The function of the sealing gasket is to fill the small gap between the pipe and the flange to prevent medium leakage.
Collar: The collar is generally made of stainless steel. Its inner diameter matches the outer diameter of the pipe and can be tightly fitted on the pipe. The function of the collar is to connect the pipe to the flange and to protect the pipe to a certain extent.

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