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Dimension of Class 2500 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 |
| 1/2 | 133.3 | 30.1 | 34.9 | 42.9 | 73.0 | 39.7 | 39.7 | 21.3 |  |
22.30 | 88.9 | 4 | 22.2 | 28.7 | |
| 3/4 | 139.7 | 31.7 | 42.9 | 50.8 | 79.4 | 42.9 | 42.9 | 26.7 | 27.70 | 85.2 | 4 | 22.2 | 31.7 | ||
| 1 | 158.7 | 34.9 | 50.8 | 57.2 | 88.9 | 47.6 | 47.6 | 33.5 | 34 54 | 107.9 | 4 | 25.4 | 35.0 | ||
| 1.1/4 | 184.1 | 38.1 | 63.5 | 73.2 | 95.2 | 52.4 | 52.4 | 42.2 | 43.20 | 130.2 | 4 | 28.6 | 38.1 | ||
| 1.1/2 | 203.2 | 44.4 | 73.0 | 79.2 | 111.1 | 60,3 | 60.3 | 48.3 | 49.50 | 146.0 | 4 | 31.7 | 44.45 | ||
| 2 | 234.9 | 50.8 | 92.1 | 95.3 | 127.0 | 69.8 | 69.8 | 60.4 | 62.00 | 171.4 | 8 | 28.6 | 50.8 | ||
| 2.1/2 | 266.7 | 57.1 | 104.8 | 114.3 | 142.8 | 79.4 | 79.4 | 73.1 | 74.70 | 196.8 | 8 | 31.7 | 57.15 | ||
| 3 | 304.8 | 66.6 | 127.0 | 133.4 | 168.3 | 92.1 | 92.1 | 88.9 | 90.70 | 228.6 | 8 | 34.9 | 63.5 | ||
| 4 | 355.6 | 76.2 | 157.2 | 165.1 | 190.5 | 107.9 | 107.9 | 114.3 | 103.50 | 273.0 | 8 | 41.3 | 69.85 | ||
| 5 | 419.1 | 92.0 | 185.7 | 203.2 | 228.6 | 130.2 | 130.2 | 141.2 | 116.00 | 323.8 | 8 | 47.6 | 76.2 | ||
| 6 | 482.6 | 107.9 | 215.9 | 235.0 | 273.0 | 152.4 | 152.4 | 168.4 | 143.80 | 368.3 | 8 | 54.0 | 82.5 | ||
| 8 | 552.4 | 127.0 | 269.9 | 304.8 | 317.5 | 177.8 | 177.8 | 219.2 | 170.50 | 438.1 | 12 | 54.0 | 95.25 | ||
| 10 | 673.1 | 165.1 | 323.8 | 374.7 | 419.1 | 228.6 | 228.6 | 273.0 | 221.50 | 539.7 | 12 | 66.7 | 107.9 | ||
| 12 | 762.0 | 184.0 | 381.0 | 441.5 | 463.5 | 254.0 | 254.0 | 323.8 | 276.40 | 619.1 | 12 | 73.0 | 120.6 |