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Type of Flanges
Class & Size Range
Weld Neck Flanges
Slip On Flanges
Socket Weld Flanges
Lap Joint Flanges
Blind Flanges
Threaded Flanges
ASME B 16.47 A
ASME B16.47 B
WN Flange Bore
Figure 8 Blanks
Ring Joint Facing
AWWA Steel Ring
AWWA Steel hub
Approx Weight
Gaskets
Bolts & Nuts
PL Flanges (EN1092.1)
WN Flanges (EN1092.1)
SO Flanges (EN1092.1)
Th Flanges (EN1092.1)
BL Flanges (EN1092.1)
Backing Rings

Threaded Flanges 















f=2mm on class 150 and 300.
  =7mm on class 400 and higher

Dimesions of  threaded flanges - ASME B16.5 


Class 150
DN 
NPS Overall Diameter  Thickness of Flange(Min) Overall Lenght  Threaded Lengh(Min) Diameter of Hub Diameter of Face Number of Bolts Diameter of Bolt Holes  Diameter of Bolt Circle 
　 　 A C D E　 F G H I J
15  1/2 90 9.6 14 16 30 34.9 4 15.7 60.3
20  3/4 100 11.2 14 16 38 42.9 4 15.7 69.9
25 1 110 12.7 16 17 49 50.8 4 15.7 79.4
32 1 1/4 115 14.3 19 21 59 63.5 4 15.7 88.9
40 1 1/2 125 15.9 21 22 65 73 4 15.7 98.4
50 2 150 17.5 24 25 78 92.1 4 19.1 120.7
65 2 1/2 180 20.7 27 29 90 104.8 4 19.1 139.7
80 3 190 22.3 29 30 108 127 4 19.1 152.4
90 3 1/2 215 22.3 30 32 122 139.7 8 19.1 177.8
100 4 230 22.3 32 33 135 157.2 8 19.1 190.5
125 5 255 22.3 35 36 164 185.7 8 22.4 215.9
150 6 280 23.9 38 40 192 215.9 8 22.4 241.3
200 8 345 27 43 44 246 269.9 8 22.4 298.5
250 10 405 28.6 48 49 305 323.8 12 25.4 362
300 12 485 30.2 54 56 365 381 12 25.4 431.8
350 14 535 33.4 56 57 400 412.8 12 28.4 476.3
400 16 595 35 62 64 457 469.9 16 28.4 539.8
450 18 635 38.1 67 68 505 533.4 16 31.75 577.9
500 20 700 41.3 71 73 559 584.2 20 31.75 635
600 24 815 46.1 81 83 663 692.2 20 35.1 749.3
Class 300
DN 
NPS Overall Diameter  Thickness of Flange(Min) Overall Lenght  Threaded Lengh(Min) Diameter of Hub Diameter of Face Number of Bolts Diameter of Bolt Holes  Diameter of Bolt Circle 
　 　 A C D E F G H I J
15
 1/2 95 12.7 21 16 38 34.9 4 15.7 66.7
20  3/4 115 14.3 24 16 48 42.9 4 19 82.6
25 1 125 15.9 25 18 54 50.8 4 19 88.9
32 1 1/4 135 17.5 25 21 64 63.5 4 19 98.4
40 1 1/2 155 19.1 29 23 70 73 4 22.3 114.3
50 2 165 20.7 32 29 84 92.1 8 19 127
65 2 1/2 190 23.9 37 32 100 104.8 8 22.3 149.2
80 3 210 27 41 32 117 127 8 22.3 168.3
90 3 1/2 230 28.6 43 37 133 139.7 8 22.3 184.2
100 4 255 30.2 46 37 146 157.2 8 22.3 200
125 5 280 33.4 49 43 178 185.7 8 22.3 235
150 6 320 35 51 47 206 215.9 12 22.3 269.9
200 8 380 39.7 60 51 260 269.9 12 25.4 330.2
250 10 445 46.1 65 56 321 323.8 16 28.4 387.4
300 12 520 49.3 71 61 375 381 16 31.7 450.8
350 14 585 52.4 75 64 425 412.8 20 31.7 514.4
400 16 650 55.6 81 69 483 469.9 20 35 571.5
450 18 710 58.8 87 70 533 533.4 24 35 628.6
500 20 775 62 94 74 587 584.2 24 35 685.8
600 24 915 68.3 105 83 702 692.2 24 41.1 812.8
Class 400
DN 
NPS Overall Diameter  Thickness of Flange(Min) Overall Lenght  Threaded Lengh(Min) Diameter of Hub Diameter of Face Number of Bolts Diameter of Bolt Holes  Diameter of Bolt Circle 
　 　 A C D E F G H I J
15
 1/2 95 14.3 22 16 38 34.9 4 15.7 66.7
20  3/4 115 15.9 25 16 48 42.9 4 19 82.6
25 1 125 17.5 27 18 54 50.8 4 19 88.9
32 1 1/4 135 20.7 29 21 64 63.5 4 19 98.4
40 1 1/2 155 22.3 32 23 70 73 4 22.3 114.3
50 2 165 25.4 37 29 84 92.1 8 19 127
65 2 1/2 190 28.6 41 32 100 104.8 8 22.3 149.2
80 3 210 31.8 46 35 117 127 8 22.3 168.3
90 3 1/2 230 35 49 40 133 139.7 8 25.4 184.2
100 4 255 35 51 37 146 157.2 8 25.4 200
125 5 280 38.1 54 43 178 185.7 8 25.4 235
150 6 320 41.3 57 46 206 215.9 12 35.4 269.9
200 8 380 47.7 68 51 260 269.9 12 28.4 330.2
250 10 445 54 73 56 321 323.8 16 31.75 387.4
300 12 520 57.2 79 61 375 381 16 35.1 450.8
350 14 585 60.4 84 64 425 412.8 20 35.1 514.4
400 16 650 63.5 94 69 483 469.9 20 38.1 571.5
450 18 710 66.7 98 70 533 533.4 24 38.1 628.6
500 20 775 69.9 102 74 587 584.2 24 41.1 685.8
600 24 915 76.2 114 83 702 692.2 24 47.8 812.8
Class 600
DN 
NPS Overall Diameter  Thickness of Flange(Min) Overall Lenght  Threaded Lengh(Min) Diameter of Hub Diameter of Face Number of Bolts Diameter of Bolt Holes  Diameter of Bolt Circle 
　 　 A C D E F G H I J
15
 1/2 95 14.3 22 16 38 34.9 4 15.7 66.7
20  3/4 115 15.9 25 16 48 42.9 4 19 82.6
25 1 125 17.5 27 18 54 50.8 4 19 88.9
32 1 1/4 135 20.7 29 21 64 63.5 4 19 98.4
40 1 1/2 155 22.3 32 23 70 73 4 22.3 114.3
50 2 165 25.4 37 29 84 92.1 8 19 127
65 2 1/2 190 28.6 41 32 100 104.8 8 22.3 149.2
80 3 210 31.8 46 35 117 127 8 22.3 168.3
90 3 1/2 230 35 49 40 133 139.7 8 25.4 184.2
100
4 275 38.1 54 42 152 157.2 8 25.4 215.9
125 5 330 44.5 60 48 189 185.7 8 28.4 266.7
150 6 355 47.7 67 51 222 215.9 12 28.4 292.1
200 8 420 55.6 76 58 273 269.9 12 31.75 349.2
250 10 510 63.5 86 66 343 323.8 16 35.1 431.8
300 12 560 66.7 92 70 400 381 20 35.1 489
350 14 605 69.9 94 74 432 412.8 20 38.1 527
400 16 685 76.2 106 78 495 469.9 20 41.1 603.2
450 18 745 82.6 117 80 546 533.4 20 44.5 654
500 20 815 88.9 127 83 610 584.2 24 44.5 723.9
600 24 940 101.6 140 93 718 692.2 24 50.8 838.2
Class 900
DN 
NPS Overall Diameter  Thickness of Flange(Min) Overall Lenght  Threaded Lengh(Min) Diameter of Hub Diameter of Face Number of Bolts Diameter of Bolt Holes  Diameter of Bolt Circle 
　 　 A C D E F G H I J
15
 1/2 120 22.3 32 23 38 34.9 4 22.3 82.6
20  3/4 130 25.4 35 26 44 42.9 4 22.3 88.9
25 1 150 28.6 41 29 52 50.8 4 25.4 101.6
32 1 1/4 160 28.6 41 31 64 63.5 4 25.4 111.1
40 1 1/2 180 31.8 44 32 70 73 4 28.4 123.8
50 2 215 38.1 57 39 105 92.1 8 25.4 165.1
65 2 1/2 245 41.3 64 48 124 104.8 8 28.4 190.5
80 3 240 38.1 54 42 127 127 8 25.4 190.5
100 4 290 44.5 70 48 159 157.2 8 31.7 235
125 5 350 50.8 79 54 190 185.7 8 35 279.4
150 6 380 55.6 86 58 235 215.9 12 31.7 317.5
200 8 470 63.5 102 64 298 269.9 12 38.1 393.7
250 10 545 69.9 108 72 368 323.8 16 38.1 469.9
300 12 610 79.4 117 77 419 381 20 38.1 533.4
350 14 640 85.8 130 83 451 412.8 20 41.1 558.8
400 16 705 88.9 133 86 508 469.9 20 44.4 616
450 18 785 101.6 152 89 565 533.4 20 50.8 685.8
500 20 855 108 159 93 622 584.2 20 53.8 749.3
600 24 1040 139.7 203 102 749 692.2 20 66.55 901.7

 Class 1500

DN 
NPS Overall Diameter  Thickness of Flange(Min) Overall Lenght  Threaded Lengh(Min) Diameter of Hub Diameter of Face Number of Bolts Diameter of Bolt Holes  Diameter of Bolt Circle 
　 　 A C D E F G H I J
15
 1/2 120 22.3 32 23 38 34.9 4 22.3 82.6
20  3/4 130 25.4 35 26 44 42.9 4 22.3 88.9
25 1 150 28.6 41 29 52 50.8 4 25.4 101.6
32 1 1/4 160 28.6 41 31 64 63.5 4 25.4 111.1
40 1 1/2 180 31.8 44 32 70 73 4 28.4 123.8
50 2 215 38.1 57 39 105 92.1 8 25.4 165.1
65 2 1/2 245 41.3 64 48 124 104.8 8 28.4 190.5

  Class 2500
DN 
NPS Overall Diameter  Thickness of Flange(Min) Overall Lenght  Threaded Lengh(Min) Diameter of Hub Diameter of Face Number of Bolts Diameter of Bolt Holes  Diameter of Bolt Circle 
　 　 A C D E F G H I J
15
 1/2 135 30.2 40 29 43 34.9 4 22.3 88.9
20  3/4 140 31.8 43 32 51 42.9 4 22.3 95.2
25 1 160 35 48 35 57 50.8 4 25.4 108
32 1 1/4 185 38.1 52 39 73 63.5 4 28.4 130.2
40 1 1/2 205 44.5 60 45 79 73 4 31.75 146
50 2 235 50.9 70 51 95 92.1 8 28.4 171.4
65 2 1/2 265 57.2 79 58 114 104.8 8 31.75 196.8

Genuine knowledge comes from practice - Karl Marx
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