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