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Dimension of Class 900 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 |
| ¾ | 130.2 | 25.4 | 42.9 | 44.4 | 69.8 | 34.9 | 34.9 | 26.7 |  |
27.70 | 88.9 | 4 | 22.2 | 11.1 | 25.4 |
| 1¼ | 158.7 | 28.6 | 63.5 | 63.5 | 73.0 | 41.3 | 41.3 | 42.2 | 43.20 | 111.1 | 4 | 25.4 | 14.3 | 30.2 | |
| 2 | 215.9 | 38.1 | 92.1 | 104.6 | 101.6 | 57.2 | 57.2 | 60.4 | 62.00 | 165.1 | 8 | 25.4 | 17.5 | 38.1 | |
| 3 | 241.3 | 38.1 | 127.0 | 133.3 | 101.6 | 54.0 | 54.0 | 88.9 | 90.70 | 190.5 | 8 | 25.4 | - | 41.4 | |
| 5 | 349.2 | 50.8 | 185.7 | 196.8 | 127.0 | 79.4 | 79.4 | 141.2 | 116.00 | 279.4 | 8 | 34.9 | - | 54.1 | |
| 8 | 469.9 | 63.5 | 269.9 | 292.1 | 161.9 | 101.6 | 114.3 | 219.2 | 170.50 | 393.7 | 12 | 38.1 | - | 63.5 | |
| 12 | 609.6 | 79.4 | 381.0 | 450.8 | 200.0 | 117.5 | 142.9 | 323.8 | 276.40 | 533.4 | 20 | 38.1 | - | 76.2 | |
| 16 | 704.8 | 88.9 | 469.9 | 552.4 | 215.9 | 133.3 | 165.9 | 406.4 | 359.20 | 615.9 | 20 | 44.4 | - | 88.9 | |
| 20 | 857.2 | 107.9 | 584.2 | 641.3 | 247.6 | 158.7 | 209.5 | 508.0 | 461.80 | 749.3 | 20 | 54.0 | - | 95.5 | |
| 26 | 1085.8 | 139.7 | 749.3 | - | 285.7 | 285.7 | 660.4 | 564.40 | 952.5 | 20 | 73.0 | - | - | ||
| 30 | 1231.9 | 149.2 | 857.2 | - | 311.1 | 311.1 | 762.0 | - | 1085.8 | 20 | 79.4 | - | - | ||
| 34 | 1397.0 | 165.1 | 965.2 | - | 349.2 | 349.2 | 863.6 | - | 1225.5 | 20 | 92.1 | - | - | ||
| 36 | 1460.5 | 171.4 | 1022.3 | - | 361.9 | 361.9 | 914.4 | - | 1289.0 | 20 | 92.1 | - | - |