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Dimension of Class 300 Flanges As Per ANSI B 16.5
| Size | D O.D |
B Thk |
G R.F Dia |
M Hub O.D |
H1 W/N |
H2 Sorf |
H3 Lap Joint |
A Neck O.D |
B1 Wnrf ID |
B2 ID SW Lap/Sorf |
K PCD |
N No of Holes |
O Hole |
DEP P |
Thread T |
| ½ | 952 | 14.3 | 34.9 | 38.1 | 524 | 22.2 | 22.4 | 21.3 | 15.7 | 22.35 | 66.7 | 4 | 15.9 | 9.6 | 15.7 |
| ¾ | 117.5 | 15.9 | 42.9 | 47.6 | 57.1 | 25.4 | 25.4 | 26.7 | 20.8 | 27.70 | 82.5 | 4 | 19.0 | 11.1 | 15.7 |
| 1 | 123.8 | 17.5 | 50.8 | 54.0 | 61.9 | 26.9 | 26.9 | 33.5 | 26.7 | 34.54 | 88.9 | 4 | 19.0 | 12.7 | 17.5 |
| 1¼ | 133.3 | 19.0 | 63.5 | 63.5 | 65.1 | 26.9 | 26.9 | 42.2 | 35.11 | 43.20 | 98.4 | 4 | 19.0 | 14.3 | 20.5 |
| 1½ | 155.6 | 20.6 | 73.0 | 69.8 | 68.3 | 30.2 | 30.2 | 48.3 | 40.9 | 49.50 | 114.3 | 4 | 22.2 | 15.9 | 22.3 |
| 2 | 165.1 | 22.2 | 92.1 | 84.1 | 69.8 | 33.3 | 33.3 | 60.4 | 52.6 | 62.00 | 127.0 | 8 | 19.0 | 17.5 | 28.4 |
| 2½ | 190.5 | 25.4 | 104.8 | 100.0 | 76.2 | 38.1 | 38.1 | 73.1 | 62.7 | 74.70 | 149.2 | 8 | 22.2 | 19.0 | 31.7 |
| 3 | 209.5 | 28.6 | 127.0 | 117.5 | 79.4 | 42.9 | 42.9 | 88.9 | 78.0 | 90.70 | 168.3 | 8 | 22.2 | 20.6 | 31.7 |
| 3.½ | 228.6 | 30.2 | 139.7 | 1334 | 81.0 | 44.4 | 44A | 101.6 | 90.2 | 103.50 | 184.1 | 8 | 222 | 36.5 | |
| 4 | 254.0 | 31.8 | 157.2 | 146.1 | 85.7 | 47.6 | 47.6 | 114.3 | 102.4 | 116.00 | 200.0 | 8 | 22.2 | - | 36.5 |
| 5 | 279.4 | 34.9 | 185.7 | 177.8 | 98.4 | 50.8 | 50.8 | 141.2 | 128.3 | 143.80 | 234.9 | 8 | 22.2 | 42.9 | |
| 6 | 317.5 | 36.5 | 215.9 | 206.4 | 98.4 | 52.4 | 52.4 | 168.4 | 152.4 | 170.50 | 269.9 | 12 | 22.2 | 45.9 | |
| 8 | 381.0 | 41.3 | 269.9 | 260.4 | 111.1 | 61.9 | 61.9 | 219.2 | 202.7 | 221.50 | 330.2 | 12 | 25.4 | - | 50.8 |
| 10 | 444.5 | 47.6 | 323.8 | 320.7 | 117.5 | 66.7 | 95.2 | 273.0 | 254.5 | 276.40 | 387.3 | 16 | 28.6 | 55.6 | |
| 12 | 520.7 | 50.8 | 381.0 | 374.6 | 130.2 | 73.0 | 101.6 | 323.8 | 304,8 | 327.20 | 450.8 | 16 | 31.7 | - | 60.4 |
| 14 | 584.2 | 54.0 | 412.7 | 425.5 | 142.9 | 76.2 | 111.1 | 355.6 | 336.6 | 359.20 | 514.4 | 20 | 31.7 | - | 63.5 |
| 16 | 647.7 | 57.2 | 469.9 | 482.6 | 146.0 | 82.5 | 120.6 | 4064 | 387,35 | 410.50 | 571.5 | 20 | 34.9 | 68.3 | |
| 18 | 711.2 | 60.3 | 533.4 | 533.4 | 158.7 | 88.9 | 130.2 | 457.2 | 438.15 | 461.80 | 628.6 | 24 | 34.9 | - | 69.8 |
| 20 | 774.7 | 63.5 | 584.2 | 587.4 | 161.9 | 95.2 | 139.7 | 508.0 | 489.00 | 513.10 | 685.8 | 24 | 34.9 | - | 73.1 |
| 22 | 838.2 | 66.7 | 641.3 | 641.2 | 165.1 | 101.6 | 146.0 | 558.8 | 539,75 | 564.40 | 742.9 | 24 | 41.3 | - | 79.5 |
| 24 | 914.4 | 69.8 | 692.1 | 701.7 | 168.3 | 106.4 | 152.4 | 609.6 | 590.55 | 616.00 | 812.8 | 24 | 41.3 | - | 82.5 |
| 26 | 971.5 | 79.4 | 749.3 | 720.7 | 184.1 | 184.1 | 660.4 | - | - | 876.3 | 28 | 44.4 | - | - | |
| 28 | 1035.0 | 85.7 | 800.1 | 774.7 | 196.8 | 196.8 | - | 711.2 | - | - | 939.8 | 28 | 44.4 | - | - |
| 30 | 1092.2 | 92.1 | 857.2 | 827.0 | 209.5 | 209.5 | - | 762.0 | - | - | 996.9 | 28 | 47.6 | - | - |
| 32 | 1149.3 | 98.4 | 9144 | 881.1 | 222.2 | 222.2 | - | 812.8 | - | - | 1054.1 | 28 | 50.8 | - | |
| 34 | 1206.5 | 101.6 | 965.2 | 936.8 | 231.8 | 231.8 | - | 863.6 | - | - | 1104.9 | 28 | 50.8 | - | - |
| 36 | 1270.0 | 104.8 | 1022.3 | 990.6 | 241.3 | 241.3 | - | 914.4 | - | - | 1168.4 | 28 | 54.0 | - | - |
| 42 | 1447.8 , | 117.5 | 1193.8 | 1099 | 200.1 | 276.2 | - | 1067 | - | - | 1339.8 | 28 | 54.0 | - |