Tables 3 Dimensions of gaskets for Class designation 150 flanges
Nominal

Size

DN		 Gasket *

inside 

diameter		 IBC 

gasket 

outside 

diameter

 Full face gasket Nominal

Size

DN
Outside

diameter

Holes

Bolt

circle 

diameter
No Diameter
¡@ ¡@ mm mm mm ¡@ mm in mm mm in
1/2 15 22 47.5 89 4 15.9 5/8 60.3 15 1/2
3/4 20 27 57 98 4 15.9 5/9 69.8 20 3/4
1 25 34 66.5 108 4 15.9 5/10 79.4 25 1
1 1/4 32 43 76 117 4 15.9 5/11 88.9 32 1 1/4
1 1/2 40 49 85.5 127 4 15.9 5/12 98.4 40 1 1/2
2 50 61 104.5 152 4 19 3/4 120.6 50 2
2 1/2 65 73 124 178 4 19 3/5 139.7 65 2 1/2
3 80 89 136.5 190 4 19 3/6 152.4 80 3
4 100 115 174.51 229 8 19 3/7 190.5 100 4
5 125 141 196.5 254 8 22.2 7/8 215.9 125 5
6 150 169 222 279 8 22.2 7/9 541.3 150 6
8 200 220 279 343 8 22.2 7/10 298.4 200 8
10 250 273 339.5 406 12 25.4 1 362 250 10
12 300 324 409.5 483 12 25.4 1 431.8 300 12
14 350 356 450.5 533 12 28.6 1 1/8 476.2 350 14
16 400 407 514 597 16 28.6 1 1/8 539.8 400 16
18 450 458 549 635 16 31.8 1 1/4 577.8 450 18
20 500 508 606.5 698 20 31.8 1 1/4 635 500 20
24 600 610 717.5 813 20 34.9 1 3/8 749.3 600 24