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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

Slip On Flanges 











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

Dimesions of  SO flanges - ASME B16.5

Class 150
DN  NPS Overall Diameter  Inside Diameter(Min.) Thickness of Flange(Min.) Overall Lenght  Diameter of Hub Diameter of Face Number of Bolts Diameter of Bolt Holes  Diameter of Bolt Circle 
　 　 A B C D F G H I J
15  1/2 90 22.2 9.6 14 30 34.9 4 15.7 60.3
20  3/4 100 27.7 11.2 14 38 42.9 4 15.7 69.9
25 1 110 34.5 12.7 16 49 50.8 4 15.7 79.4
32 1 1/4 115 43.2 14.3 19 59 63.5 4 15.7 88.9
40 1 1/2 125 49.5 15.9 21 65 73 4 15.7 98.4
50 2 150 61.9 17.5 24 78 92.1 4 19.1 120.7
65 2 1/2 180 74.6 20.7 27 90 104.8 4 19.1 139.7
80 3 190 90.7 22.3 29 108 127 4 19.1 152.4
90 3 1/2 215 103.4 22.3 30 122 139.7 8 19.1 177.8
100 4 230 116.1 22.3 32 135 157.2 8 19.1 190.5
125 5 255 143.8 22.3 35 164 185.7 8 22.4 215.9
150 6 280 170.7 23.9 38 192 215.9 8 22.4 241.3
200 8 345 221.5 27 43 246 269.9 8 22.4 298.5
250 10 405 276.2 28.6 48 305 323.8 12 25.4 362
300 12 485 327 30.2 54 365 381 12 25.4 431.8
350 14 535 359.2 33.4 56 400 412.8 12 28.4 476.3
400 16 595 410.5 35 62 457 469.9 16 28.4 539.8
450 18 635 461.8 38.1 67 505 533.4 16 31.75 577.9
500 20 700 513.1 41.3 71 559 584.2 20 31.75 635
600 24 815 616 46.1 81 663 692.2 20 35.1 749.3
Class 300
DN 
NPS Overall Diameter  Inside Diameter(Min.) Thickness of Flange(Min.) Overall Lenght  Diameter of Hub Diameter of Face Number of Bolts Diameter of Bolt Holes  Diameter of Bolt Circle 
　 　 A B C D F G H I J
15  1/2 95 22.2 12.7 21 38 34.9 4 15.7 66.7
20  3/4 115 27.7 14.3 24 48 42.9 4 19 82.6
25 1 125 34.5 15.9 25 54 50.8 4 19 88.9
32 1 1/4 135 43.2 17.5 25 64 63.5 4 19 98.4
40 1 1/2 155 49.5 19.1 29 70 73 4 22.3 114.3
50 2 165 61.9 20.7 32 84 92.1 8 19 127
65 2 1/2 190 74.6 23.9 37 100 104.8 8 22.3 149.2
80 3 210 90.7 27 41 117 127 8 22.3 168.3
90 3 1/2 230 103.4 28.6 43 133 139.7 8 22.3 184.2
100 4 255 116.1 30.2 46 146 157.2 8 22.3 200
125 5 280 143.8 33.4 49 178 185.7 8 22.3 235
150 6 320 170.7 35 51 206 215.9 12 22.3 269.9
200 8 380 221.5 39.7 60 260 269.9 12 25.4 330.2
250 10 445 276.2 46.1 65 321 323.8 16 28.4 387.4
300 12 520 327 49.3 71 375 381 16 31.7 450.8
350 14 585 359.2 52.4 75 425 412.8 20 31.7 514.4
400 16 650 410.5 55.6 81 483 469.9 20 35 571.5
450 18 710 461.8 58.8 87 533 533.4 24 35 628.6
500 20 775 513.1 62 94 587 584.2 24 35 685.8
600 24 915 616 68.3 105 702 692.2 24 41.1 812.8

Class 400

DN 
NPS Overall Diameter  Inside Diameter(Min.) Thickness of Flange(Min.) Overall Lenght  Diameter of Hub Diameter of Face Number of Bolts Diameter of Bolt Holes  Diameter of Bolt Circle 
　 　 A B C D F G H I J
15  1/2 95 22.2 14.3 22 38 34.9 4 15.7 66.7
20  3/4 115 27.7 15.9 25 48 42.9 4 19 82.6
25 1 125 34.5 17.5 27 54 50.8 4 19 88.9
32 1 1/4 135 43.2 20.7 29 64 63.5 4 19 98.4
40 1 1/2 155 49.5 22.3 32 70 73 4 22.3 114.3
50 2 165 61.9 25.4 37 84 92.1 8 19 127
65 2 1/2 190 74.6 28.6 41 100 104.8 8 22.3 149.2
80 3 210 90.7 31.8 46 117 127 8 22.3 168.3
90 3 1/2 230 103.4 35 49 133 139.7 8 25.4 184.2
100 4 255 116.1 35 51 146 157.2 8 25.4 200
125 5 280 143.8 38.1 54 178 185.7 8 25.4 235
150 6 320 170.7 41.3 57 206 215.9 12 35.4 269.9
200 8 380 221.5 47.7 68 260 269.9 12 28.4 330.2
250 10 445 276.2 54 73 321 323.8 16 31.75 387.4
300 12 520 327 57.2 79 375 381 16 35.1 450.8
350 14 585 359.2 60.4 84 425 412.8 20 35.1 514.4
400 16 650 410.5 63.5 94 483 469.9 20 38.1 571.5
450 18 710 461.8 66.7 98 533 533.4 24 38.1 628.6
500 20 775 513.1 69.9 102 587 584.2 24 41.1 685.8
600 24 915 616 76.2 114 702 692.2 24 47.8 812.8


Class 600
DN 
NPS Overall Diameter  Inside Diameter Thickness of Flange(Min.) Overall Lenght  Diameter of Hub Diameter of Face Number of Bolts Diameter of Bolt Holes  Diameter of Bolt Circle 
　 　 A B C D F G H I J
15  1/2 95 22.2 14.3 22 38 34.9 4 15.7 66.7
20  3/4 115 27.7 15.9 25 48 42.9 4 19 82.6
25 1 125 34.5 17.5 27 54 50.8 4 19 88.9
32 1 1/4 135 43.2 20.7 29 64 63.5 4 19 98.4
40 1 1/2 155 49.5 22.3 32 70 73 4 22.3 114.3
50 2 165 61.9 25.4 37 84 92.1 8 19 127
65 2 1/2 190 74.6 28.6 41 100 104.8 8 22.3 149.2
80 3 210 90.7 31.8 46 117 127 8 22.3 168.3
90 3 1/2 230 103.4 35 49 133 139.7 8 25.4 184.2
100 4 275 116.1 38.1 54 152 157.2 8 25.4 215.9
125 5 330 143.8 44.5 60 189 185.7 8 28.4 266.7
150 6 355 170.7 47.7 67 222 215.9 12 28.4 292.1
200 8 420 221.5 55.6 76 273 269.9 12 31.75 349.2
250 10 510 276.2 63.5 86 343 323.8 16 35.1 431.8
300 12 560 327 66.7 92 400 381 20 35.1 489
350 14 605 359.2 69.9 94 432 412.8 20 38.1 527
400 16 685 410.5 76.2 106 495 469.9 20 41.1 603.2
450 18 745 461.8 82.6 117 546 533.4 20 44.5 654
500 20 815 513.1 88.9 127 610 584.2 24 44.5 723.9
600 24 940 616 101.6 140 718 692.2 24 50.8 838.2

Class 900
DN 
NPS Overall Diameter  Inside Diameter Thickness of Flange(Min.) Overall Lenght  Diameter of Hub Diameter of Face Number of Bolts Diameter of Bolt Holes  Diameter of Bolt Circle 
　 　 A B C D F G H I J
15  1/2 120 22.2 22.3 32 38 34.9 4 22.3 82.6
20  3/4 130 27.7 25.4 35 44 42.9 4 22.3 88.9
25 1 150 34.5 28.6 41 52 50.8 4 25.4 101.6
32 1 1/4 160 43.2 28.6 41 64 63.5 4 25.4 111.1
40 1 1/2 180 49.5 31.8 44 70 73 4 28.4 123.8
50 2 215 61.9 38.1 57 105 92.1 8 25.4 165.1
65 2 1/2 245 74.6 41.3 64 124 104.8 8 28.4 190.5
80 3 240 103.4 38.1 54 127 127 8 25.4 190.5
100 4 290 116.1 44.5 70 159 157.2 8 31.7 235
125 5 350 143.8 50.8 79 190 185.7 8 35 279.4
150 6 380 170.7 55.6 86 235 215.9 12 31.7 317.5
200 8 470 221.5 63.5 102 298 269.9 12 38.1 393.7
250 10 545 276.2 69.9 108 368 323.8 16 38.1 469.9
300 12 610 327 79.4 117 419 381 20 38.1 533.4
350 14 640 359.2 85.8 130 451 412.8 20 41.1 558.8
400 16 705 410.5 88.9 133 508 469.9 20 44.4 616
450 18 785 461.8 101.6 152 565 533.4 20 50.8 685.8
500 20 855 513.1 108 159 622 584.2 20 53.8 749.3
600 24 1040 616 139.7 203 749 692.2 20 66.55 901.7
Class 1500
DN 
NPS Overall Diameter  Inside Diameter Thickness of Flange(Min.) Overall Lenght  Diameter of Hub Diameter of Face Number of Bolts Diameter of Bolt Holes  Diameter of Bolt Circle 
　 　 A B C D F G H I J
15  1/2 120 22.2 22.3 32 38 34.9 4 22.3 82.6
20  3/4 130 27.7 25.4 35 44 42.9 4 22.3 88.9
25 1 150 34.5 28.6 41 52 50.8 4 25.4 101.6
32 1 1/4 160 43.2 28.6 41 64 63.5 4 25.4 111.1
40 1 1/2 180 49.5 31.8 44 70 73 4 28.4 123.8
50 2 215 61.9 38.1 57 105 92.1 8 25.4 165.1
65 2 1/2 245 74.6 41.3 64 124 104.8 8 28.4 190.5

Tolerances of Slip On Flanges ASME B16.5

 Outside Diameter (Note)
 Inside Diameter
 OD≤ 610mm = ± 2.0 mm | > 610 mm= ± 3.0 mm  NPS ≤ 10 = + 1.0 mm / -0 | NPS≥ 12 = +1.5 mm / -0
 Diameter of Contact Face  Outside Diameter of Hub  (Note)
 2 mm RF= ± 1 mm  NPS ≤ 12 = + 2.4 mm / -1.6mm | NPS≥ 14 = ± 3.2 mm 
 7 mm RF, Tongue & Groove / Male-Female = ± 0.5 mm 　
 Length through Hub (Note)  Drilling
 NPS ≤ 18 = + 3.2 mm / - 0.8 mm |NPS ≥ 20 = + 4.8 mm / - 1.6 mm        Bolt Circle = 1.6 mm | Bolt Hole Spacing = ± 0.8 mm
 Thickness
 NPS≤ 18 = + 3.0 mm / - 0 | NPS≥ 20 = + 5.0 mm / - 0  Eccentricity of Bolt Circle with Respect to Facing
 NPS≥ 6 = + 4.0 mm / - 1.0 mm  ≤ 2½ = 0.8 mm max. | ≥ 3 = 1.6 mm max

Note:These tolerances are not listed in ASME B16.5


Genuine knowledge comes from practice - Karl Marx
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