Flange Types And Dimensions

Size Standard Class Outside ø Pitch Circle ø Bolt Hole ø No. of Bolt Holes
1/2″ (DN15) ASME B16.5 150 90 60.3 15.9 4
300 95 66.7 15.9 4
BS EN1092 Pt.1 PN10 95 65 14 4
PN16
BS10 Table D 95 66.7 14.3 4
Table E
3/4″ (DN20) ASME B16.5 150 100 69.9 15.9 4
300 115 82.6 19.1 4
BS EN1092 Pt.1 PN10 105 75 14 4
PN16
BS10 Table D 101.6 73 14.3 4
Table E
1″ (DN25) ASME B16.5 150 110 79.4 15.9 4
300 125 88.9 19.1 4
BS EN1092 Pt.1 PN10 115 85 14 4
PN16
BS10 Table D 114.3 82.6 14.3 4
Table E
1 1/2″ (DN40) ASME B16.5 150 125 98.4 15.9 4
300 155 114.3 22.2 4
BS EN1092 Pt.1 PN10 150 110 18 4
PN16
BS10 Table D 133.4 98.4 14.3 4
Table E
2″ (DN50) ASME B16.5 150 150 120.7 19.1 4
300 165 127 19.1 8
BS EN1092 Pt.1 PN10 165 125 18 4
PN16
BS10 Table D 152.4 114.3 17.5 4
Table E
3″ (DN80) ASME B16.5 150 190 152.4 19.1 4
300 210 168.3 22.2 8
BS EN1092 Pt.1 PN10 200 160 18 8
PN16
BS10 Table D 184.2 146.1 17.5 4
Table E
4″ (DN100) ASME B16.5 150 230 190.5 19.1 8
300 255 200 22.2 8
BS EN1092 Pt.1 PN10 220 180 18 8
PN16
BS10 Table D 215.9 177.8 17.5 4
Table E 8
6″ (DN150) ASME B16.5 150 280 241.3 22.2 8
300 320 269.9 22.2 12
BS EN1092 Pt.1 PN10 285 240 22 8
PN16
BS10 Table D 279.4 235 17.5 8
Table E 22.2
8″ (DN200) ASME B16.5 150 345 298.5 22.2 8
300 380 330.2 25.4 12
BS EN1092 Pt.1 PN10 340 295 22 8
PN16 12
BS10 Table D 336.6 292.1 17.5 8
Table E 22.2
10″ (DN250) ASME B16.5 150 405 362.0 25.4 12
300 445 87.4 28.6 16
BS EN1092 Pt.1 PN10 395 350 22 12
PN16 405 355 26
BS10 Table D 406.4 355.6 22.2 8
Table E 12
12″ (DN300) ASME B16.5 150 485 431.8 25.4 12
300 520 450.8 31.8 16
BS EN1092 Pt.1 PN10 445 400 22 12
PN16 460 410 26
BS10 Table D 457.2 406.4 22.2 12
Table E 25.4
14″ (DN350) ASME B16.5 150 535 476.3 28 12
300 585 514.4 32 20
BS EN1092 Pt.1 PN10 505 460 22 16
PN16 520 470 26
BS10 Table D 527.1 469.9 25.4 12
Table E 25.4