ASME B16.5 Plate Flange Dimensions
ASME B16.5 – one of ASME’s more popular standards — covers pipe flanges and flanged fittings for flanges with rating class designations 150, 300, 400, 600, 900, and 1500 in sizes NPS 1/2 through NPS 24; plus flanges with rating class designation 2500 in sizes NPS 1/2 through NPS 12.
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ASME B16.5 Plate Flange Class 150 LBS Dimensions
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| NPS | D | b | g | m | J | k | Holes | l | Kg. |
| 1/2″ | 88.9 | 11.1 | 34.9 | 30.2 | 22.3 | 60.3 | 4 | 15.9 | 0.4 |
| 3/4″ | 98.4 | 12.7 | 42.9 | 38.1 | 27.7 | 69.8 | 4 | 15.9 | 0.7 |
| 1″ | 107.9 | 14.3 | 50.8 | 49.2 | 34.5 | 79.4 | 4 | 15.9 | 0.8 |
| 1 1/4″ | 117.5 | 15.9 | 63.5 | 58.8 | 43.2 | 88.9 | 4 | 15.9 | 1.1 |
| 1 1/2″ | 127 | 17.5 | 73 | 65.1 | 49.5 | 98.4 | 4 | 15.9 | 1.4 |
| 2″ | 152.4 | 19 | 92.1 | 77.8 | 62 | 120.6 | 4 | 19 | 2.2 |
| 2 1/2″ | 177.8 | 22.2 | 104.8 | 90.5 | 74.7 | 139.7 | 4 | 19 | 3.6 |
| 3″ | 190.5 | 23.8 | 127 | 107.9 | 90.7 | 152.4 | 4 | 19 | 4.1 |
| 3 1/2″ | 215.9 | 23.8 | 139.7 | 122.2 | 103.4 | 177.8 | 8 | 19 | 5.2 |
| 4″ | 228.6 | 23.8 | 157.2 | 134.9 | 116.1 | 190.5 | 8 | 19 | 5.6 |
| 5″ | 254 | 23.8 | 185.7 | 163.6 | 143.8 | 215.9 | 8 | 22.2 | 6.3 |
| 6″ | 279.4 | 25.4 | 215.9 | 192.1 | 170.7 | 241.3 | 8 | 22.2 | 7.5 |
| 8″ | 342.9 | 28.6 | 269.9 | 246.1 | 221.5 | 298.4 | 8 | 22.2 | 12.6 |
| 10″ | 406.4 | 30.2 | 323.8 | 304.8 | 276.3 | 361.9 | 12 | 25.4 | 18.5 |
| 12″ | 482.6 | 31.7 | 381 | 365.1 | 327.1 | 431.8 | 12 | 25.5 | 28 |
| 14″ | 533.4 | 34.9 | 412.7 | 400 | 359.1 | 476.2 | 12 | 28.6 | 36 |
| 16″ | 596.9 | 36.5 | 469.9 | 457.2 | 410.5 | 539.7 | 16 | 28.6 | 46 |
| 18″ | 635 | 39.7 | 533.4 | 504.8 | 461.8 | 577.8 | 16 | 31.7 | 50 |
| 20″ | 698.5 | 42.9 | 584.2 | 558.8 | 513.1 | 635 | 20 | 31.7 | 64 |
| 22″ | 749.3 | 46 | 641.2 | 609.6 | 564.4 | 692.1 | 20 | 34.9 | 72 |
| 24″ | 812.8 | 47.6 | 692.1 | 663.6 | 615.9 | 749.3 | 20 | 34.9 | 89 |
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ASME B16.5 Plate Flange Class 300 LBS Dimensions
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| NPS | D | b | g | m | J | k | Holes | l | Kg. |
| 1/2″ | 95.6 | 14.3 | 34.9 | 38.1 | 22.3 | 66.7 | 4 | 15.9 | 0.7 |
| 3/4″ | 117.5 | 15.9 | 42.9 | 47.6 | 27.7 | 82.5 | 4 | 19 | 1.1 |
| 1″ | 123.8 | 17.5 | 50.8 | 54 | 34.5 | 88.9 | 4 | 19 | 1.4 |
| 1 1/4″ | 133.3 | 19 | 63.5 | 63.5 | 43.2 | 98.4 | 4 | 19 | 1.8 |
| 1 1/2″ | 155.6 | 20.6 | 73 | 69.8 | 49.5 | 114.3 | 4 | 22.2 | 2.6 |
| 2″ | 165.1 | 22.2 | 92.1 | 84.1 | 62 | 127 | 8 | 19 | 3.4 |
| 2 1/2″ | 190.5 | 25.4 | 104.8 | 100 | 74.7 | 149.2 | 8 | 22.2 | 4.4 |
| 3″ | 209.5 | 28.6 | 127 | 117.5 | 90.7 | 168.3 | 8 | 22.2 | 6.1 |
| 3 1/2″ | 228.6 | 30.2 | 139.7 | 133.3 | 103.4 | 184.1 | 8 | 22.2 | 7.5 |
| 4″ | 254 | 31.7 | 157.2 | 146 | 116.1 | 200 | 8 | 22.2 | 10.1 |
| 5″ | 279.4 | 34.9 | 185.7 | 177.8 | 143.8 | 234.9 | 8 | 22.2 | 12.5 |
| 6″ | 317.5 | 36.5 | 215.9 | 206.4 | 170.7 | 269.9 | 12 | 22.2 | 14.1 |
| 8″ | 381 | 41.3 | 269.9 | 260.3 | 221.5 | 330.2 | 12 | 25.4 | 24.8 |
| 10″ | 444.5 | 47.6 | 323.8 | 320.7 | 276.3 | 387.3 | 16 | 28.6 | 37.1 |
| 12″ | 520.7 | 50.8 | 381 | 374.6 | 327.1 | 450.8 | 16 | 31.7 | 50 |
| 14″ | 584.2 | 54 | 412.7 | 425.4 | 359.1 | 514.3 | 20 | 31.7 | 70 |
| 16″ | 647.7 | 57.1 | 469.9 | 482.6 | 410.5 | 571.5 | 20 | 34.9 | 90 |
| 18″ | 711.2 | 60.3 | 533.4 | 533.4 | 461.8 | 628.6 | 24 | 34.9 | 112 |
| 20″ | 774.7 | 63.5 | 584.2 | 584.2 | 513.1 | 685.8 | 24 | 34.9 | 133 |
| 22″ | 838.2 | 66.7 | 641.2 | 641.2 | 564.4 | 742.9 | 24 | 41.3 | 197 |
| 24″ | 914.4 | 69.8 | 692.1 | 701.7 | 615.9 | 812.8 | 24 | 41.3 | 208 |
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ASME B16.5 Plate Flange Class 600 LBS Dimensions
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| NPS | D | b | g | m | J | k | Holes | l | Kg. |
| 1/2″ | 95.2 | 14.3 | 34.9 | 38.1 | 22.3 | 66.7 | 4 | 15.9 | 0.8 |
| 3/4″ | 117.5 | 15.9 | 42.9 | 47.6 | 27.7 | 82.5 | 4 | 19 | 1.4 |
| 1″ | 123.8 | 17.5 | 50.8 | 54 | 34.5 | 88.9 | 4 | 19 | 1.6 |
| 1 1/4″ | 133.3 | 20.6 | 63.5 | 63.5 | 43.2 | 98.4 | 4 | 19 | 2.1 |
| 1 1/2″ | 155.6 | 22.2 | 73 | 69.8 | 49.5 | 114.3 | 4 | 22.2 | 3.1 |
| 2″ | 165.1 | 25.4 | 92.1 | 84.1 | 62 | 127 | 8 | 19 | 3.7 |
| 2 1/2″ | 190.5 | 28.6 | 104.8 | 100 | 74.7 | 149.2 | 8 | 22.2 | 5.4 |
| 3″ | 209.5 | 31.7 | 127 | 117.5 | 90.7 | 168.3 | 8 | 22.2 | 7.3 |
| 3 1/2″ | 228.6 | 34.9 | 139.7 | 133.3 | 103.4 | 184.1 | 8 | 25.4 | 8.9 |
| 4″ | 273 | 38.1 | 157.2 | 152.4 | 116.1 | 215.9 | 8 | 25.4 | 11.8 |
| 5″ | 330.2 | 44.4 | 185.7 | 188.9 | 143.8 | 266.7 | 8 | 28.6 | 24.5 |
| 6″ | 355.6 | 47.6 | 215.9 | 222.2 | 170.7 | 292.1 | 12 | 28.6 | 29.5 |
| 8″ | 419.1 | 55.6 | 269.9 | 273 | 221.5 | 349.2 | 12 | 31.7 | 43 |
| 10″ | 508 | 63.5 | 323.8 | 342.8 | 276.3 | 431.8 | 16 | 34.9 | 70 |
| 12″ | 558.8 | 66.7 | 381 | 400 | 327.1 | 488.9 | 20 | 34.9 | 86 |
| 14″ | 603.2 | 69.8 | 412.7 | 431.8 | 359.1 | 527 | 20 | 38.1 | 100 |
| 16″ | 685.8 | 76.2 | 469.9 | 495.3 | 410.5 | 603.2 | 20 | 41.3 | 142 |
| 18″ | 742.9 | 82.5 | 533.4 | 546.1 | 461.8 | 654 | 20 | 44.4 | 175 |
| 20″ | 812.8 | 88.9 | 584.2 | 609.6 | 513.1 | 723.9 | 24 | 44.4 | 232 |
| 22″ | 869.9 | 95.2 | 641.2 | 666.7 | 564.4 | 777.9 | 24 | 47.6 | 292 |
| 24″ | 939.8 | 101.6 | 692.1 | 717.5 | 615.9 | 838.2 | 24 | 50.8 | 330 |
