ASME B16.5 Lap Joint Flange Dimension
ASME B16.5 Lap joint flange （LAPJ）serves as critical component in pipeline connection systems, primarily used in low-pressure operating conditions. Their unique structural design allows the flange ring to rotate freely, significantly enhancing installation convenience and alignment accuracy, making them particularly suitable for pipeline systems requiring regular disassembly or position adjustments. This product strictly complies with the ASME B16.5 standard specifications, with pressure ratings ranging from Class 150 to Class 2500. It has widespread applications across various industrial sectors, including petrochemicals, natural gas transmission, power engineering, and water treatment.This article will provide a detailed introduction to ASME B16.5 slip on flange dimension.
What Is a Lap Joint Flange? A lap joint flange is a special type of flange connection device used in industrial piping systems. Its typical structure consists of two parts: a flange ring and a stub end. The flange ring is secured to the flanged or welded ring with bolts to achieve a sealed connection.
Lap joint flanges do not come into direct contact with the medium, but instead achieve sealing through stub end or flange rings. This design not only reduces the cost of flange materials (low-grade carbon steel can be used), but also allows the use of highly corrosion-resistant materials (such as stainless steel, alloy steel, etc.) at the pipe ends, thereby optimizing overall economy while ensuring sealing performance.
Dimension of ASME B16.5 Lap Joint Flange(LAPJ)： Lap joint flange is classified into seven categories according to pressure ratings: 150#, 300#, 400#,600# , 900# ,1500# ,2500#.
LAPJ Flange Class 150 lb: Nominal Pipe Size A B C D R F H I J Weight inch mm mm mm mm mm mm mm Holes mm mm kg / piece 1/2 21.30 88.90 22.90 11.20 15.70 3.000 30.20 4 15.70 60.45 0.38 3/4 26.70 98.60 28.2 12.70 15.70 3.000 38.10 4 15.70 69.85 0.55 1 33.40 108.0 35. 10 14.20 17.50 3.000 49.30 4 15.70 79.25 0.76 11/4 42.20 117.3 43.70 15.70 20.60 4.800 58.70 4 15.70 88.90 1.01 11/2 48.30 127.0 50.00 17.50 22.40 6.400 65.00 4 15.70 98.60 1.30 2 60.30 152.4 62.50 19. 10 25.40 7.900 77.70 4 19.10 120.7 2.03 21/2 73.00 177.8 75.40 22.40 28.40 7.900 90.40 4 19.10 139.7 3.25 3 88.90 190.5 91.40 23.90 30.20 9.700 108.0 4 19.10 152.4 3.81 31/2 101.6 215.9 104.1 23.90 31.75 9.700 122.2 8 19.10 177.8 4.76 4 114.3 228.6 116.8 23.90 33.30 11.20 134.9 8 19.10 190.5 5.25 5 141.3 254.0 114.5 23.90 36.60 11.20 163.6 8 22.40 215.9 6.02 6 168.3 279.4 171.5 25.40 39.6 12.70 192.0 8 22.40 241.3 7.40 8 219. 1 342.9 222.3 28.40 44.50 12.70 246. 1 8 22.40 298.5 12.1 10 273.0 406.4 277.4 30.20 49.30 12.70 304.8 12 25.40 362.0 16.4 12 323.8 482.6 328.2 31.75 55.60 12.70 365.3 12 25.40 431.8 26.1 14 355.6 533.4 360.2 35. 10 79.25 12.70 400. 1 12 28.40 476.3 34.5 16 406.4 596.9 411.2 36.60 87.40 12.70 457.2 16 28.4 539.8 44.6 18 457.2 635.0 462.3 39.60 96.80 12.70 505.0 16 31.75 577.9 48.7 20 508.0 698.5 514.4 42.90 103.1 12.70 558.8 20 31.75 635.0 61.6 24 609.6 812.8 616.0 47.80 111.3 12.70 663.4 20 35.10 749.3 86.6
LAPJ Flange Class 30 0 lb: Nominal Pipe Size A B C D R F H I J Weight inch mm mm mm mm mm mm mm Holes mm mm kg / piece 1/2 21.30 95.20 22.90 14.20 22.30 3.000 38.10 4 15.70 66.55 0.62 3/4 26.70 117.3 28.20 15.70 25.40 3.000 47.70 4 19.00 82.50 1.10 1 33.40 123.9 35.10 17.50 26.90 3.000 53.80 4 19.0 88.90 1.33 11/4 42.20 133.3 43.70 19.00 26.90 4.800 63.50 4 19.00 98.50 1.65 11/2 48.30 155.4 50.00 20.60 30.20 6.400 69.85 4 22.30 114.3 2.44 2 60.30 165.1 62.50 22.30 33.20 7.900 84.00 8 19.10 127.0 2.83 21/2 73.00 190.5 75.40 25.40 38.10 7.900 100.0 8 22.3 149.3 4.25 3 88.90 209.5 91.40 28.40 42.90 9.700 117.3 8 22.30 168.1 5.78 31/2 101.6 228.6 104.1 30.20 44.40 9.700 133.3 8 22.30 184.1 7.27 4 114.3 254.0 116.8 31.70 47.70 11.20 146.0 8 22.30 200.1 9.55 5 141.3 279.4 114.5 35.0 50.80 11.20 177.8 8 22.30 234.9 12.2 6 168.3 317.5 171.5 36.50 52.30 12.70 206.2 12 22.30 269.7 15.5 8 219.1 381.0 222.3 41. 10 61.90 12.70 260.3 12 25.40 330.2 24.1 10 273.0 444.5 277.4 47.70 95.20 12.70 320.5 16 28.40 387.3 34.4 12 323.8 520.7 328.2 50.80 101.6 12.70 374.6 16 31.70 450.8 50.4 14 355.6 584.2 360.2 53.80 111.2 12.70 425.4 20 31.70 514.3 70.9 16 406.4 647.7 411.2 57. 15 120.6 12.70 482.6 20 35.00 571.5 89.5 18 457.2 711.2 462.3 60.45 130.0 12.70 533.4 24 35.00 628.6 111 20 508.0 774.7 514.4 63.50 139.7 12.70 587.2 24 35.0 685.8 137 24 609.6 914.4 616.0 69.8 152.4 12.70 701.5 24 41.10 812.8 204
LAPJ Flange Class 40 0 lb: Nominal Pipe Size A B C D R F H I J Weight inch mm mm mm mm mm mm mm Holes mm mm kg / piece 1/2 21.30 95.30 22.90 14.20 22.40 3.000 38.10 4 15.70 66.55 0.72 3/4 26.70 117.3 28.20 15.70 25.40 3.000 47.80 4 19. 10 82.60 1.25 1 33.40 124.0 35.10 17.50 26.90 3.000 53.80 4 19. 10 88.90 1.50 11/4 42.20 133.4 43.70 20.60 28.40 4.800 63.50 4 19. 10 98.60 2.00 11/2 48.30 155.4 50.00 22.40 31.75 6.400 69.85 4 22.40 114.3 2.92 2 60.30 165.1 62.50 25.40 36.60 7.900 84.10 8 19. 10 127.0 3.55 21/2 73.00 190.5 75.40 28.40 41.10 7.900 100.1 8 22.40 149.4 5.23 3 88.90 209.6 91.4 31.75 46.00 9.700 117.3 8 22.40 168. 1 6.95 31/2 101.6 228.6 104.1 35.10 49.30 9.700 133.4 8 25.40 184.2 8.78 4 114.3 254.0 116.8 35.10 50.80 11.20 146.1 8 25.40 200.2 10.9 5 141.3 279.4 114.5 38.10 53.80 11.20 177.8 8 25.40 235.0 13.7 6 168.3 317.5 171.5 41.10 57.15 12.70 206.2 12 25.40 269.7 18.0 8 219.1 381.0 222.3 47.80 68.30 12.70 260.4 12 28.40 330.2 28.3 10 273.0 444.5 277.4 53.80 101.6 12.70 320.5 16 31.75 387.4 38.8 12 323.8 520.7 328.2 57.15 108.0 12.70 374.7 16 35. 10 450.9 56.6 14 355.6 584.2 360.2 60.45 117.3 12.70 425.5 20 35. 10 514.4 78.6 16 406.4 647.7 411.2 63.50 127.0 12.70 482.6 20 38. 10 571.5 100 18 457.2 711.2 462.3 66.55 136.7 12.70 533.4 24 38. 10 628.7 122 20 508.0 774.7 514.4 69.85 146.1 12.70 587.2 24 41. 10 685.8 145 24 609.6 914.4 616.0 76.20 158.8 12.70 701.5 24 47.80 812.8 217
LAPJ Flange Class 60 0 lb: Nominal Pipe Size A B C D R F H I J Weight inch mm mm mm mm mm mm mm Holes mm mm kg / piece 1/2 21.30 95.30 22.90 14.20 22.40 3.000 38.10 4 15.70 66.55 0.72 3/4 26.70 117.3 28.20 15.70 25.40 3.000 47.80 4 19. 10 82.60 1.25 1 33.40 124.0 35.10 17.50 26.90 3.000 53.8 4 19. 10 88.90 1.50 11/4 42.20 133.4 43.70 20.60 28.40 4.800 63.50 4 19. 10 98.60 2.00 11/2 48.30 155.4 50.00 22.40 31.75 6.400 69.85 4 22.40 114.3 2.92 2 60.30 165.1 62.50 25.40 36.60 7.900 84.1 8 19. 10 127.0 3.55 21/2 73.00 190.5 75.40 28.40 41. 10 7.900 100.1 8 22.40 149.4 5.23 3 88.90 209.6 91.40 31.75 46.00 9.700 117.3 8 22.40 168.1 6.95 31/2 101.6 228.6 104.1 35.10 49.30 9.700 133.4 8 25.40 184.2 8.78 4 114.3 273.1 116.8 38.10 53.80 11.20 152.4 8 25.40 215.9 14.4 5 141.3 330.2 114.5 44.50 60.45 11.20 189.0 8 28.40 266.7 24.3 6 168.3 355.6 171.5 47.80 66.55 12.70 222.3 12 28.40 292.1 28.5 8 219.1 419.1 222.3 55.60 76.20 12.70 273.1 12 31.75 349.3 43.1 10 273.0 508.0 277.4 63.50 111.3 12.70 342.9 16 35. 10 431.8 70.5 12 323.8 558.8 328.2 66.55 117.3 12.70 400.1 20 35. 10 489.0 86.1 14 355.6 603.3 360.2 69.85 127.0 12.70 431.8 20 38. 10 527.1 100 16 406.4 685.8 411.2 76.20 139.7 12.70 495.3 20 41. 10 603.3 145 18 457.2 743.0 462.3 82.60 152.4 12.70 546.1 20 44.50 654.1 177 20 508.0 812.8 514.4 88.90 165.1 12.70 609.6 24 44.50 723.9 225 24 609.6 939.8 616.0 101.6 184.2 12.70 717.6 24 50.80 838.2 318
LAPJ Flange Class 90 0 lb: Nominal Pipe Size A B C D R F H I J Weight inch mm mm mm mm mm mm mm Holes mm mm kg / piece 1/2 21.30 120.6 22.90 22.30 31.70 3.000 38.10 4 22.30 82.5 1.71 3/4 26.70 130.0 28.20 25.40 35.00 3.000 44.40 4 22.30 88.90 2.30 1 33.40 149.3 35.10 28.40 41.10 3.000 52.30 4 25.40 101.6 3.40 11/4 42.20 158.7 43.70 28.40 41.10 4.800 63.50 4 25.40 111.2 3.85 11/2 48.30 177.8 50.00 31.70 44.40 6.400 69.85 4 28.40 123.9 5.28 2 60.30 215.9 62.50 38.10 57.15 7.900 104.6 8 25.40 165. 1 9.78 21/2 73.00 244.3 75.40 41.10 63.50 7.900 123.9 8 28.40 190.5 13.6 3 88.90 241.3 91.40 38.10 53.80 9.700 127.0 8 25.40 190.5 11.3 4 114.3 292.1 116.8 44.40 69.85 11.20 158.7 8 31.70 234.9 19.2 5 141.3 349.2 114.5 50.80 79.25 11.20 190.5 8 35.00 279.4 31.20 6 168.3 381.0 171.5 55.60 85.80 12.70 234.9 12 31.70 317.5 40.50 8 219.1 469.9 222.3 63.50 114.3 12.70 298.4 12 38.10 393.7 71.5 10 273.0 546.1 277.4 69.85 127.0 12.70 368.3 16 38.10 469.9 104 12 323.8 609.6 328.2 79.25 142.7 12.70 419.1 20 38.10 533.4 139 14 355.6 641.3 360.2 85.80 155.4 12.70 450.8 20 41.10 558.8 161 16 406.4 704.8 411.2 88.90 165.1 12.70 508.0 20 44.40 615.9 194 18 457.2 787.4 462.3 101.6 190.5 12.70 565.1 20 50.80 685.8 267 20 508.0 857.2 514.4 107.9 209.5 12.70 622.3 20 53.80 749.3 334 24 609.6 1041.4 616.0 139.7 266.7 12.70 749.3 20 66.55 901.7 618
LAPJ Flange Class 150 0 lb: Nominal Pipe Size A B C D R F H I J Weight inch mm mm mm mm mm mm mm Holes mm mm kg / piece 1/2 21.30 120.6 22.90 22.30 31.70 3.000 38.10 4 22.30 82.50 1.71 3/4 26.70 130.0 28.20 25.40 35.00 3.000 44.40 4 22.30 88.90 2.30 1 33.40 149.3 35. 10 28.40 41.10 3.000 52.30 4 25.40 101.6 3.40 11/4 42.20 158.7 43.70 28.40 41.10 4.800 63.50 4 25.40 111.2 3.85 11/2 48.30 177.8 50.00 31.70 44.40 6.400 69.85 4 28.40 123.9 5.28 2 60.30 215.9 62.50 38.10 57.15 7.900 104.6 8 25.40 165.1 9.78 21/2 73.00 244.3 75.40 41.10 63.50 7.900 123.9 8 28.40 190.5 13.6 3 88.90 266.7 91.40 47.70 73.15 9.700 133.3 8 31.70 203.2 17.8 4 114.3 311.1 116.8 53.80 90.40 11.20 162.0 8 35.00 241.3 27.5 5 141.3 374.6 114.5 73.15 104.60 11.20 196.8 8 41.10 292.1 51.5 6 168.3 399.7 171.5 82.50 119. 1 12.70 228.6 12 38.10 317.5 62.0 8 219. 1 482.6 222.3 91.90 142.7 12.70 292.1 12 44.40 393.7 105 10 273.0 584.2 277.4 107.9 177.8 12.70 368.3 12 50.80 482.6 179 12 323.8 673.1 328.2 123.9 218.9 12.70 450.8 16 53.80 571.5 269 14 355.6 749.3 360.2 133.3 241.3 12.70 495.3 16 60.45 635.0 365 16 406.4 825.5 411.2 146.0 260.3 12.70 552.4 16 66.55 704.8 459 18 457.2 914.4 462.3 162.0 276.3 12.70 596.9 16 73.15 774.7 598 20 508.0 984.2 514.4 177.8 292.1 12.70 641.3 16 79.25 831.8 712 24 609.6 1168.4 616.0 203.2 330.2 12.70 762.0 16 91.90 990.6 1090
LAPJ Flange Class 250 0 lb: Nominal Pipe Size A B C D R F H I J Weight inch mm mm mm mm mm mm mm Holes mm mm kg / piece 1/2 21.30 133.4 22.90 30.20 39.60 3.000 42.90 4 22.40 88.90 2.92 3/4 26.70 139.7 28.20 31.75 42.90 3.000 50.80 4 22.40 95.30 3.40 1 33.40 158.8 35. 10 35.10 47.80 3.000 57. 15 4 25.40 108.0 4.77 11/4 42.20 184.2 43.70 38.10 52.30 4.800 73. 15 4 28.40 130.0 7.08 11/2 48.30 203.2 50.00 44.50 60.45 6.400 79.25 4 31.75 146.1 9.93 2 60.30 235.0 62.50 50.80 69.85 7.900 95.30 8 28.40 171.5 14.7 21/2 73.00 266.7 75.40 57.15 79.25 7.900 114.3 8 31.75 196.9 21.3 3 88.90 304.8 91.40 66.55 91.90 9.700 133.4 8 35.10 228.6 32.3 4 114.3 355.6 116.8 76.20 108.0 11.20 165.1 8 41.10 273.1 52.5 5 141.3 419.1 114.5 91.90 130.0 11.20 203.2 8 47.80 323.9 82.6 6 168.3 482.6 171.5 4.250 152.4 12.70 235.0 8 53.80 368.3 127 8 219. 1 552.5 222.3 5.000 177.8 12.70 304.8 12 53.80 438.2 186 10 273.0 673.1 277.4 165.1 228.6 12.70 374.7 12 66.55 539.8 352 12 323.8 762.0 328.2 184.2 254.0 12.70 441.5 12 73.15 619.3 501
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