Gasket dimensions for male – female and tongue and groove gaskets
ANSI flanges – all pressure classes
| Nominal diameter | Large male-female | Small tongue and groove | Large tongue and groove | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Class 150-1500 | Class 2500 | Outer diameter | Inner diameter | Outer diameter | Inner diameter | |||||||||||
| Outer diameter | Inner diameter | Outer diameter | Inner diameter | |||||||||||||
| 1/4 | 1 | 25.4 | 1/2 | 12.7 | – | – | – | – | – | – | 1 | 1/2 | ||||
| 1/2 | 1 3/8 | 34.9 | 1 | 25.4 | 1 3/8 | 34.9 | 13/16 | 20.6 | 1 3/8 | 34.9 | 1 | 25.4 | 1 3/8 | 34.9 | 1 | 25.4 |
| 3/4 | 1 11/16 | 42.9 | 1 5/16 | 33.3 | 1 11/16 | 42.9 | 1 1/16 | 27.0 | 1 11/16 | 42.9 | 1 5/16 | 33.3 | 1 11/16 | 42.9 | 1 5/16 | 33.3 |
| 1 | 2 | 50.8 | 1 1/2 | 38.1 | 2 | 50.8 | 1 1/4 | 31.8 | 1 7/8 | 47.6 | 1 1/2 | 38.1 | 2 | 50.8 | 1 1/2 | 38.1 |
| 1 1/4 | 2 1/2 | 63.5 | 1 7/8 | 47.6 | 2 1/2 | 63.5 | 1 5/8 | 41.3 | 2 1/4 | 57.2 | 1 7/8 | 47.6 | 2 1/2 | 63.5 | 1 7/8 | 47.6 |
| 1 1/2 | 2 7/8 | 73.0 | 2 1/8 | 54.0 | 2 7/8 | 73.0 | 1 7/8 | 47.6 | 2 1/2 | 63.5 | 2 1/8 | 54.0 | 2 7/8 | 73.0 | 2 1/8 | 54.0 |
| 2 | 3 5/8 | 92.1 | 2 7/8 | 73.0 | 3 5/8 | 92.1 | 2 3/8 | 60.3 | 3 1/4 | 82.6 | 2 7/8 | 73.0 | 3 5/8 | 92.1 | 2 7/8 | 73.0 |
| 2 1/2 | 4 1/8 | 104.8 | 3 3/8 | 85.7 | 4 1/8 | 104.8 | 3 | 76.2 | 3 3/4 | 95.3 | 3 3/8 | 85.7 | 4 1/8 | 104.8 | 3 3/8 | 85.7 |
| 3 | 5 | 127.0 | 4 1/4 | 108.0 | 5 | 127.0 | 3 3/4 | 95.3 | 4 5/8 | 117.5 | 4 1/4 | 108.0 | 5 | 127.0 | 4 1/4 | 108.0 |
| 3 1/2 | 5 1/2 | 139.7 | 4 3/4 | 120.7 | – | – | – | – | 5 1/8 | 130.2 | 4 3/4 | 120.7 | 5 1/2 | 139.7 | 4 3/4 | 120.7 |
| 4 | 6 3/16 | 157.2 | 5 3/16 | 131.8 | 6 3/16 | 157.2 | 4 3/4 | 120.7 | 5 11/16 | 144.5 | 5 3/16 | 131.8 | 6 3/16 | 157.2 | 5 3/16 | 131.8 |
| 4 1/2 | 6 3/4 | 171.5 | 5 11/16 | 144.5 | – | – | – | – | – | – | – | – | 6 3/4 | 171.5 | 5 11/16 | 144.5 |
| 5 | 7 5/16 | 185.7 | 6 5/16 | 160.3 | 7 5/16 | 185.7 | 5 3/4 | 146.1 | 6 13/16 | 173.0 | 6 5/16 | 160.3 | 7 5/16 | 185.7 | 6 5/1 | 160.3 |
| 6 | 8 1/2 | 215.9 | 7 1/2 | 190.5 | 8 1/2 | 215.9 | 6 3/4 | 171.5 | 8 | 203.2 | 7 1/2 | 190.5 | 8 1/2 | 215.9 | 7 1/2 | 190.5 |
| 8 | 10 5/8 | 269.9 | 9 3/8 | 238.1 | 10 5/8 | 269.9 | 8 3/4 | 222.3 | 10 | 254.0 | 9 3/8 | 238.1 | 10 5/8 | 269.9 | 9 3/8 | 238.1 |
| 10 | 12 3/4 | 323.9 | 11 1/4 | 285.8 | 12 3/4 | 323.9 | 10 3/4 | 273.1 | 12 | 304.8 | 11 1/4 | 285.8 | 12 3/4 | 323.9 | 11 1/4 | 285.8 |
| 12 | 15 | 381.0 | 13 1/2 | 342.9 | 15 | 381.0 | 13 | 330.2 | 14 1/4 | 362.0 | 13 1/2 | 342.9 | 15 | 381.0 | 13 1/2 | 342.9 |
| 14 | 16 1/4 | 412.8 | 14 3/4 | 374.7 | – | – | – | – | 15 1/2 | 393.7 | 14 3/4 | 374.7 | 16 1/4 | 412.8 | 14 3/4 | 374.7 |
| 16 | 18 1/2 | 469.9 | 17 | 431.8 | – | – | – | – | 17 5/8 | 447.7 | 16 3/4 | 425.5 | 18 1/2 | 469.9 | 17 | 431.8 |
| 18 | 21 | 533.4 | 19 1/4 | 489.0 | – | – | – | – | 20 1/8 | 511.2 | 19 1/4 | 489.0 | 21 | 533.4 | 19 1/4 | 489.0 |
| 20 | 23 | 584.2 | 21 | 533.4 | – | – | – | – | 22 | 558.8 | 21 | 533.4 | 23 | 584.2 | 21 | 533.4 |
| 24 | 27 1/4 | 692.2 | 25 1/4 | 641.4 | – | – | – | – | 26 1/4 | 666.8 | 25 1/4 | 641.4 | 27 1/4 | 692.2 | 25 1/4 | 641.4 |
