Lap Joint Flanges have all the same common dimensions as any other flange named on this page however it does not have a raised face, they used in conjunction with a “Lap Joint Stub End”. These flanges are nearly identical to a Slip On flange with the exception of a radius at the intersection of the flange face and the bore to accommodate the flanged portion of the Stub End.
ASME B16.5 Lap Joint Flange Dimensions
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ASME B16.5 Loose Flange Lap Joint Flange Class 150 LBS Dimensions
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| NPS | A | B | I | Holes | C | D | F | Weight |
| 1/2″ | 89 | 22.9 | 15.7 | 4 | 11.2 | 15.7 | 30.2 | 0.45 |
| 3/4″ | 99 | 28.2 | 15.7 | 4 | 12.7 | 15.7 | 38.1 | 0.64 |
| 1″ | 108 | 35.1 | 15.7 | 4 | 14.2 | 17.5 | 49.3 | 0.85 |
| 1-1/4″ | 117 | 43.7 | 15.7 | 4 | 15.7 | 20.6 | 58.7 | 1.09 |
| 1-1/2″ | 127 | 50 | 15.7 | 4 | 17.5 | 22.4 | 65 | 1.42 |
| 2″ | 152 | 62.5 | 19.1 | 4 | 19.1 | 25.4 | 77.7 | 2.17 |
| 2-1/2″ | 178 | 75.4 | 19.1 | 4 | 22.4 | 28.4 | 90.4 | 3.48 |
| 3″ | 191 | 91.4 | 19.1 | 4 | 23.9 | 30.2 | 108 | 4.06 |
| 3-1/2″ | 216 | 104.1 | 19.1 | 8 | 23.9 | 31.8 | 122.2 | 5.05 |
| 4″ | 229 | 116.8 | 19.1 | 8 | 23.9 | 33.3 | 134.9 | 5.55 |
| 5″ | 254 | 144.5 | 22.4 | 8 | 23.9 | 36.6 | 163.6 | 6.3 |
| 6″ | 279 | 171.5 | 22.4 | 8 | 25.4 | 39.6 | 192 | 7.61 |
| 8″ | 343 | 222.3 | 22.4 | 8 | 28.4 | 44.5 | 246.1 | 12.35 |
| 10″ | 406 | 277.4 | 25.4 | 12 | 30.2 | 49.3 | 304.8 | 16.8 |
| 12″ | 483 | 328.2 | 25.4 | 12 | 31.8 | 55.6 | 365.3 | 26.88 |
| 14″ | 533 | 360.2 | 28.4 | 12 | 35.1 | 79.25 | 400.1 | 39.56 |
| 16″ | 597 | 411.2 | 28.4 | 16 | 36.6 | 87.4 | 457.2 | 51.87 |
| 18″ | 635 | 462.3 | 31.8 | 16 | 39.6 | 96.8 | 505 | 56.88 |
| 20″ | 699 | 514.4 | 31.8 | 20 | 42.9 | 103.1 | 558.8 | 71.58 |
| 24″ | 813 | 616 | 35.1 | 20 | 47.8 | 111.3 | 663.4 | 99.44 |
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ASME B16.5 Loose Flange Lap Joint Flange Class 300 LBS Dimensions
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| NPS | A | B | I | Holes | C | D | F | Weight |
| 1/2″ | 95 | 22.9 | 15.7 | 4 | 14.2 | 22.4 | 38.1 | 0.7 |
| 3/4″ | 117 | 28.2 | 19.1 | 4 | 15.7 | 25.4 | 47.8 | 1.2 |
| 1″ | 124 | 35.1 | 19.1 | 4 | 17.5 | 26.9 | 53.8 | 1.46 |
| 1-1/4″ | 133 | 43.7 | 19.1 | 4 | 19.1 | 26.9 | 63.5 | 1.79 |
| 1-1/2″ | 155 | 50 | 22.4 | 4 | 20.6 | 30.2 | 69.9 | 2.62 |
| 2″ | 165 | 62.5 | 19.1 | 8 | 22.1 | 33.3 | 84.1 | 3 |
| 2-1/2″ | 191 | 75.4 | 22.4 | 8 | 25.4 | 38.1 | 100.1 | 4.53 |
| 3″ | 210 | 91.4 | 22.4 | 8 | 28.4 | 42.9 | 117.3 | 6.04 |
| 3-1/2″ | 229 | 104.1 | 22.4 | 8 | 30.2 | 44.5 | 133.4 | 7.61 |
| 4″ | 254 | 116.8 | 22.4 | 8 | 31.8 | 47.8 | 146.1 | 9.95 |
| 5″ | 279 | 144.5 | 22.4 | 8 | 35.1 | 50.8 | 177.8 | 12.5 |
| 6″ | 318 | 171.5 | 22.4 | 12 | 36.6 | 52.3 | 206.2 | 16.09 |
| 8″ | 381 | 222.3 | 25.4 | 12 | 41.1 | 62 | 260.4 | 24.67 |
| 10″ | 445 | 277.4 | 28.4 | 16 | 47.8 | 95.3 | 320.5 | 39.42 |
| 12″ | 521 | 328.2 | 31.8 | 16 | 50.8 | 101.6 | 374.7 | 56.45 |
| 14″ | 584 | 360.2 | 31.8 | 20 | 53.8 | 111.3 | 425.5 | 81.57 |
| 16″ | 648 | 411.2 | 35.1 | 20 | 57.2 | 120.7 | 482.6 | 104.75 |
| 18″ | 711 | 462.3 | 35.1 | 24 | 60.5 | 130 | 533.4 | 128.15 |
| 20″ | 775 | 514.4 | 35.1 | 24 | 63.5 | 139.7 | 587.2 | 157.65 |
| 24″ | 914 | 616 | 41.1 | 24 | 69.9 | 152.4 | 701.5 | 236.32 |
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ASME B16.5 Loose Flange Lap Joint Flange Class 400 LBS Dimensions
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| NPS | A | B | I | Holes | C | D | F | Weight |
| 1/2″ | 95.3 | 22.9 | 15.7 | 4 | 14.2 | 22.4 | 38.1 | 0.71 |
| 3/4″ | 117.3 | 28.2 | 19.1 | 4 | 15.7 | 25.4 | 47.8 | 1.2 |
| 1″ | 124 | 35.1 | 19.1 | 4 | 17.5 | 26.9 | 53.8 | 1.46 |
| 1-1/4″ | 133.4 | 43.7 | 19.1 | 4 | 20.6 | 28.4 | 63.5 | 1.93 |
| 1-1/2″ | 155.4 | 50 | 22.4 | 4 | 22.4 | 31.75 | 69.85 | 2.85 |
| 2″ | 165.1 | 62.5 | 19.1 | 8 | 25.4 | 36.6 | 84.1 | 3.42 |
| 2-1/2″ | 190.5 | 75.4 | 22.4 | 8 | 28.4 | 41.1 | 100.1 | 5 |
| 3″ | 209.6 | 91.4 | 22.4 | 8 | 31.75 | 46 | 117.3 | 6.65 |
| 3-1/2″ | 228.6 | 104.1 | 25.4 | 8 | 35.1 | 49.3 | 133.4 | 8.46 |
| 4″ | 254 | 116.8 | 25.4 | 8 | 35.1 | 50.8 | 146.1 | 10.64 |
| 5″ | 279.4 | 144.5 | 25.4 | 8 | 38.1 | 53.8 | 177.8 | 13.26 |
| 6″ | 317.5 | 171.5 | 25.4 | 12 | 41.1 | 57.15 | 206.2 | 17.43 |
| 8″ | 381 | 222.3 | 28.4 | 12 | 47.8 | 68.3 | 260.4 | 27.69 |
| 10″ | 444.5 | 277.4 | 31.75 | 16 | 53.8 | 101.6 | 320.5 | 42.26 |
| 12″ | 520.7 | 328.2 | 35.1 | 16 | 57.15 | 108 | 374.7 | 60.88 |
| 14″ | 584.2 | 360.2 | 35.1 | 20 | 60.45 | 117.3 | 425.5 | 87.64 |
| 16″ | 647.7 | 411.2 | 38.1 | 20 | 63.5 | 127 | 482.6 | 111.66 |
| 18″ | 711.2 | 462.3 | 38.1 | 24 | 66.55 | 136.7 | 533.4 | 136.17 |
| 20″ | 774.7 | 514.4 | 41.1 | 24 | 69.85 | 146.1 | 587.2 | 164.75 |
| 24″ | 914.4 | 616 | 47.8 | 24 | 76.2 | 158.8 | 701.5 | 246.15 |
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ASME B16.5 Loose Flange Lap Joint Flange Class 600 LBS Dimensions
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| NPS | A | B | I | Holes | C | D | F | Weight |
| 1/2″ | 95 | 22.9 | 15.7 | 4 | 14.2 | 22.4 | 38.1 | 0.7 |
| 3/4″ | 117 | 28.2 | 19.1 | 4 | 15.7 | 25.4 | 47.8 | 1.2 |
| 1″ | 124 | 35.1 | 19.1 | 4 | 17.5 | 26.9 | 53.8 | 1.46 |
| 1-1/4″ | 133 | 43.7 | 19.1 | 4 | 20.6 | 28.4 | 63.5 | 1.92 |
| 1-1/2″ | 155 | 50 | 22.4 | 4 | 22.4 | 31.8 | 69.9 | 2.83 |
| 2″ | 165 | 62.5 | 19.1 | 8 | 25.4 | 36.6 | 84.1 | 3.41 |
| 2-1/2″ | 191 | 75.4 | 22.4 | 8 | 28.4 | 41.1 | 100.1 | 5.03 |
| 3″ | 210 | 91.4 | 22.4 | 8 | 31.8 | 46 | 117.3 | 6.69 |
| 3-1/2″ | 229 | 104.1 | 25.4 | 8 | 35.1 | 49.3 | 133.4 | 8.5 |
| 4″ | 273 | 116.8 | 25.4 | 8 | 38.1 | 53.8 | 152.4 | 14.02 |
| 5″ | 330 | 144.5 | 28.4 | 8 | 44.5 | 60.5 | 189 | 23.84 |
| 6″ | 356 | 171.5 | 28.4 | 12 | 47.8 | 66.5 | 222.3 | 28.14 |
| 8″ | 419 | 222.3 | 31.8 | 12 | 55.6 | 76.2 | 273.1 | 42.28 |
| 10″ | 508 | 277.4 | 35.1 | 16 | 63.5 | 111.3 | 342.9 | 75.16 |
| 12″ | 559 | 328.2 | 35.1 | 20 | 66.5 | 117.3 | 400.1 | 90.25 |
| 14″ | 603 | 360.2 | 38.1 | 20 | 69.9 | 127 | 431.8 | 108.24 |
| 16″ | 686 | 411.2 | 41.1 | 20 | 76.2 | 139.7 | 495.3 | 155.63 |
| 18″ | 743 | 462.3 | 44.5 | 20 | 82.6 | 152.4 | 546.1 | 188.49 |
| 20″ | 813 | 514.4 | 44.5 | 24 | 88.9 | 165.1 | 609.6 | 241.47 |
| 24″ | 940 | 616 | 50.8 | 24 | 101.6 | 184.2 | 717.6 | 346 |
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ASME B16.5 Loose Flange Lap Joint Flange Class 600 LBS Dimensions
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| NPS | A | B | I | Holes | C | D | F | Weight |
| 1/2″ | 120.6 | 22.9 | 22.3 | 4 | 22.3 | 31.7 | 38.1 | 1.71 |
| 3/4″ | 130 | 28.2 | 22.3 | 4 | 25.4 | 35 | 44.4 | 2.28 |
| 1″ | 149.3 | 35.1 | 25.4 | 4 | 28.4 | 41.1 | 52.3 | 3.35 |
| 1-1/4″ | 158.7 | 43.7 | 25.4 | 4 | 28.4 | 41.1 | 63.5 | 3.79 |
| 1-1/2″ | 177.8 | 50 | 28.4 | 4 | 31.7 | 44.4 | 69.85 | 5.25 |
| 2″ | 215.9 | 62.5 | 25.4 | 8 | 38.1 | 57.15 | 104.6 | 9.65 |
| 2-1/2″ | 244.3 | 75.4 | 28.4 | 8 | 41.1 | 63.5 | 123.9 | 13.38 |
| 3″ | 241.3 | 91.4 | 25.4 | 8 | 38.1 | 53.8 | 127 | 11.26 |
| 4″ | 292.1 | 116.8 | 31.7 | 8 | 44.4 | 69.85 | 158.7 | 19.23 |
| 5″ | 349.2 | 144.5 | 35 | 8 | 50.8 | 79.25 | 190.5 | 31.29 |
| 6″ | 381 | 171.5 | 31.7 | 12 | 55.6 | 85.8 | 234.9 | 40.34 |
| 8″ | 469.9 | 222.3 | 38.1 | 12 | 63.5 | 114.3 | 298.4 | 72.69 |
| 10″ | 546.1 | 277.4 | 38.1 | 16 | 69.85 | 127 | 368.3 | 105.97 |
| 12″ | 609.6 | 328.2 | 38.1 | 20 | 79.25 | 142.7 | 419.1 | 141.33 |
| 14″ | 641.3 | 360.2 | 41.1 | 20 | 85.8 | 155.4 | 450.8 | 162.58 |
| 16″ | 704.8 | 411.2 | 44.4 | 20 | 88.9 | 165.1 | 508 | 199.78 |
| 18″ | 787.4 | 462.3 | 50.8 | 20 | 101.6 | 190.5 | 565.1 | 280.05 |
| 20″ | 857.2 | 514.4 | 53.8 | 20 | 107.9 | 209.5 | 622.3 | 351.11 |
| 24″ | 1041.4 | 616 | 66.55 | 20 | 139.7 | 266.7 | 749.3 | 673.48 |
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ASME B16.5 Loose Flange Lap Joint Flange Class 1500 LBS Dimensions
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| NPS | A | B | I | Holes | C | D | F | Weight |
| 1/2″ | 120.6 | 22.9 | 22.3 | 4 | 22.3 | 31.7 | 38.1 | 1.71 |
| 3/4″ | 130 | 28.2 | 22.3 | 4 | 25.4 | 35 | 44.4 | 2.28 |
| 1″ | 149.3 | 35.1 | 25.4 | 4 | 28.4 | 41.1 | 52.3 | 3.35 |
| 1-1/4″ | 158.7 | 43.7 | 25.4 | 4 | 28.4 | 41.1 | 63.5 | 3.79 |
| 1-1/2″ | 177.8 | 50 | 28.4 | 4 | 31.7 | 44.4 | 69.85 | 5.25 |
| 2″ | 215.9 | 62.5 | 25.4 | 8 | 38.1 | 57.15 | 104.6 | 9.65 |
| 2-1/2″ | 244.3 | 75.4 | 28.4 | 8 | 41.1 | 63.5 | 123.9 | 13.38 |
| 3″ | 266.7 | 91.4 | 31.7 | 8 | 47.7 | 73.15 | 133.3 | 17.57 |
| 4″ | 311.1 | 116.8 | 35 | 8 | 53.8 | 90.4 | 162 | 27.17 |
| 5″ | 374.6 | 144.5 | 41.1 | 8 | 73.15 | 104.6 | 196.8 | 51.24 |
| 6″ | 399.7 | 171.5 | 38.1 | 12 | 82.5 | 119.1 | 228.6 | 62.6 |
| 8″ | 482.6 | 222.3 | 44.4 | 12 | 91.9 | 142.7 | 292.1 | 101.8 |
| 10″ | 584.2 | 277.4 | 50.8 | 12 | 107.9 | 177.8 | 368.3 | 180.54 |
| 12″ | 673.1 | 328.2 | 53.8 | 16 | 123.9 | 218.9 | 450.8 | 284.37 |
| 14″ | 749.3 | 360.2 | 60.45 | 16 | 133.3 | 241.3 | 495.3 | 383.7 |
| 16″ | 825.5 | 411.2 | 66.55 | 16 | 146 | 260.3 | 552.4 | 493.3 |
| 18″ | 914.4 | 462.3 | 73.15 | 16 | 162 | 276.3 | 596.9 | 636.61 |
| 20″ | 984.2 | 514.4 | 79.25 | 16 | 177.8 | 292.1 | 641.3 | 764.97 |
| 24″ | 1168.4 | 616 | 91.9 | 16 | 203.2 | 330.2 | 762 | 1223.13 |
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ASME B16.5 Loose Flange Lap Joint Flange Class 2500 LBS Dimensions
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| NPS | A | B | I | Holes | C | D | F | Weight |
| 1/2″ | 133.4 | 22.9 | 22.4 | 4 | 30.2 | 39.6 | 42.9 | 2.92 |
| 3/4″ | 139.7 | 28.2 | 22.4 | 4 | 31.75 | 42.9 | 50.8 | 3.39 |
| 1″ | 158.8 | 35.1 | 25.4 | 4 | 35.1 | 47.8 | 57.15 | 4.79 |
| 1-1/4″ | 184.2 | 43.7 | 28.4 | 4 | 38.1 | 52.3 | 73.15 | 7.06 |