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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

Lap Joint Flanges 

Dimesions of  lap joint flanges - ASME B16.5 


 Class 150

DN 
NPS Overall Diameter  Inside Diameter(Min.) Thickness of Flange(Min.) Overall Lenght  Lap  Radius Diameter of Hub Number of Bolts Diameter of Bolt Holes  Diameter of Bolt Circle 
　 　 A B C D R F H I J
15  1/2 90 22.9 11.2 16 3 30 4 15.7 60.3
20  3/4 100 28.2 12.7 16 3 38 4 15.7 69.9
25 1 110 34.9 14.3 17 3 49 4 15.7 79.4
32 1 1/4 115 43.7 15.9 21 5 59 4 15.7 88.9
40 1 1/2 125 50 17.5 22 6 65 4 15.7 98.4
50 2 150 62.5 19.1 25 8 78 4 19.1 120.7
65 2 1/2 180 75.4 22.3 29 8 90 4 19.1 139.7
80 3 190 91.4 23.9 30 10 108 4 19.1 152.4
90 3 1/2 215 104.1 23.9 32 10 122 8 19.1 177.8
100 4 230 116.8 23.9 33 11 135 8 19.1 190.5
125 5 255 144.4 23.9 36 11 164 8 22.4 215.9
150 6 280 171.4 25.4 40 13 192 8 22.4 241.3
200 8 345 222.2 28.6 44 13 246 8 22.4 298.5
250 10 405 277.4 30.2 49 13 305 12 25.4 362
300 12 485 328.2 31.8 56 13 365 12 25.4 431.8
350 14 535 360.2 35 79 13 400 12 28.4 476.3
400 16 595 411.2 36.6 87 13 457 16 28.4 539.8
450 18 635 462.3 39.7 97 13 505 16 31.75 577.9
500 20 700 514.4 42.9 103 13 559 20 31.75 635
600 24 815 616 47.7 111 13 663 20 35.1 749.3

Class 300

DN 
NPS Overall Diameter  Inside Diameter(Min.) Thickness of Flange(Min.) Overall Lenght  Lap Radius Diameter of Hub Number of Bolts Diameter of Bolt Holes  Diameter of Bolt Circle 
　 　 A B C D R F H I J
15
 1/2 95 22.9 14.3 22 3 38 4 15.7 66.7
20  3/4 115 28.2 15.9 25 3 48 4 19 82.6
25 1 125 34.9 17.5 27 3 54 4 19 88.9
32 1 1/4 135 43.7 19.1 27 5 64 4 19 98.4
40 1 1/2 155 50 20.7 30 6 70 4 22.3 114.3
50 2 165 62.5 22.3 33 8 84 8 19 127
65 2 1/2 190 75.4 25.4 38 8 100 8 22.3 149.2
80 3 210 91.4 28.6 43 10 117 8 22.3 168.3
90 3 1/2 230 104.1 30.2 44 10 133 8 22.3 184.2
100 4 255 116.8 31.8 48 11 146 8 22.3 200
125 5 280 144.4 35 51 11 178 8 22.3 235
150 6 320 171.4 36.6 52 13 206 12 22.3 269.9
200 8 380 222.2 41.3 62 13 260 12 25.4 330.2
250 10 445 277.4 47.7 95 13 321 16 28.4 387.4
300 12 520 328.2 50.8 102 13 375 16 31.7 450.8
350 14 585 360.2 54 111 13 425 20 31.7 514.4
400 16 650 411.2 57.2 121 13 483 20 35 571.5
450 18 710 462.3 60.4 130 13 533 24 35 628.6
500 20 775 514.4 63.5 140 13 587 24 35 685.8
600 24 915 616 69.9 152 13 702 24 41.1 812.8

 Class 400
DN 
NPS Overall Diameter  Inside Diameter(Min.) Thickness of Flange(Min.) Overall Lenght  Lap Radius Diameter of Hub Number of Bolts Diameter of Bolt Holes  Diameter of Bolt Circle 
　 　 A B C D R F H I J
15
 1/2 95 22.9 14.3 22 3 38 4 15.7 66.7
20  3/4 115 28.2 15.9 25 3 48 4 19 82.6
25 1 125 34.9 17.5 27 3 54 4 19 88.9
32 1 1/4 135 43.7 20.7 29 5 64 4 19 98.4
40 1 1/2 155 50 22.3 32 6 70 4 22.3 114.3
50 2 165 62.5 25.4 37 8 84 8 19 127
65 2 1/2 190 75.4 28.6 41 8 100 8 22.3 149.2
80 3 210 91.4 31.8 46 10 117 8 22.3 168.3
90 3 1/2 230 104.1 35 49 10 133 8 25.4 184.2
100 4 255 116.8 35 51 11 146 8 25.4 200
125 5 280 144.5 38.1 54 11 178 8 25.4 235
150 6 320 171.4 41.3 57 13 206 12 35.4 269.9
200 8 380 222.2 47.7 68 13 260 12 28.4 330.2
250 10 445 277.4 54 102 13 321 16 31.75 387.4
300 12 520 328.2 57.2 108 13 375 16 35.1 450.8
350 14 585 360.2 60.4 117 13 425 20 35.1 514.4
400 16 650 411.2 63.5 127 13 483 20 38.1 571.5
450 18 710 462.3 66.7 137 13 533 24 38.1 628.6
500 20 775 514.4 69.9 146 13 587 24 41.1 685.8
600 24 915 616 76.2 159 13 702 24 47.8 812.8

Class 600

DN 
NPS Overall Diameter  Inside Diameter(Min.) Thickness of Flange(Min.) Overall Lenght  Lap Radius Diameter of Hub Number of Bolts Diameter of Bolt Holes  Diameter of Bolt Circle 
　 　 A B C D R F H I J
15
 1/2 95 22.9 14.3 22 3 38 4 15.7 66.7
20  3/4 115 28.2 15.9 25 3 48 4 19 82.6
25 1 125 34.9 17.5 27 3 54 4 19 88.9
32 1 1/4 135 43.7 20.7 29 5 64 4 19 98.4
40 1 1/2 155 50 22.3 32 6 70 4 22.3 114.3
50 2 165 62.5 25.4 37 8 84 8 19 127
65 2 1/2 190 75.4 28.6 41 8 100 8 22.3 149.2
80 3 210 91.4 31.8 46 10 117 8 22.3 168.3
90 3 1/2 230 104.1 35 49 10 133 8 25.4 184.2
100
4 275 116.8 38.1 54 11 152 8 25.4 215.9
125 5 330 144.4 44.5 60 11 189 8 28.4 266.7
150 6 355 171.4 47.7 67 13 222 12 28.4 292.1
200 8 420 222.2 55.6 76 13 273 12 31.75 349.2
250 10 510 277.4 63.5 111 13 343 16 35.1 431.8
300 12 560 328.2 66.7 117 13 400 20 35.1 489
350 14 605 360.2 69.9 127 13 432 20 38.1 527
400 16 685 411.2 76.2 140 13 495 20 41.1 603.2
450 18 745 462.3 82.6 152 13 546 20 44.5 654
500 20 815 514.4 88.9 165 13 610 24 44.5 723.9
600 24 940 616 101.6 184 13 718 24 50.8 838.2

Class 900
DN 
NPS Overall Diameter  Inside Diameter(Min.) Thickness of Flange(Min.) Overall Lenght  Lap Radius Diameter of Hub Number of Bolts Diameter of Bolt Holes  Diameter of Bolt Circle 
　 　 A B C D R F H I J
15
 1/2 120 22.9 22.3 32 3 38 4 22.3 82.6
20  3/4 130 28.2 25.4 35 3 44 4 22.3 88.9
25 1 150 34.9 28.6 41 3 52 4 25.4 101.6
32 1 1/4 160 43.7 28.6 41 5 64 4 25.4 111.1
40 1 1/2 180 50 31.8 44 6 70 4 28.4 123.8
50 2 215 62.5 38.1 57 8 105 8 25.4 165.1
65 2 1/2 245 75.4 41.3 64 8 124 8 28.4 190.5
80 3 240 91.4 38.1 54 10 127 8 25.4 190.5
100 4 290 116.8 44.5 70 11 159 8 31.7 235
125 5 350 144.4 50.8 79 11 190 8 35 279.4
150 6 380 171.4 55.6 86 13 235 12 31.7 317.5
200 8 470 222.2 63.5 114 13 298 12 38.1 393.7
250 10 545 277.4 69.9 127 13 368 16 38.1 469.9
300 12 610 328.2 79.4 143 13 419 20 38.1 533.4
350 14 640 360.2 85.8 156 13 451 20 41.1 558.8
400 16 705 411.2 88.9 165 13 508 20 44.4 616
450 18 785 462.3 101.6 190 13 565 20 50.8 685.8
500 20 855 514.4 108 210 13 622 20 53.8 749.3
600 24 1040 616 139.7 267 13 749 20 66.55 901.7
Class 1500
DN 
NPS Overall Diameter  Inside Diameter(Min.) Thickness of Flange(Min.) Overall Lenght  Lap Radius Diameter of Hub Number of Bolts Diameter of Bolt Holes  Diameter of Bolt Circle 
　 　 A B C D R F H I J
15
 1/2 120 22.9 22.3 32 3 38 4 22.3 82.6
20  3/4 130 28.2 25.4 35 3 44 4 22.3 88.9
25 1 150 34.9 28.6 41 3 52 4 25.4 101.6
32 1 1/4 160 43.7 28.6 41 5 64 4 25.4 111.1
40 1 1/2 180 50 31.8 44 6 70 4 28.4 123.8
50 2 215 62.5 38.1 57 8 105 8 25.4 165.1
65 2 1/2 245 75.4 41.3 64 8 124 8 28.4 190.5
80 3 265 91.4 47.7 73 10 133 8 25.4 190.5
100 4 310 116.8 54 90 11 162 8 31.7 235
125 5 375 144.4 73.1 105 11 197 8 35 279.4
150 6 395 171.4 82.6 119 13 229 12 31.7 317.5
200 8 485 222.2 92.1 143 13 292 12 38.1 393.7
250 10 585 277.4 108 178 13 368 16 38.1 469.9
300 12 675 328.2 123.9 219 13 451 20 38.1 533.4
350 14 750 360.2 133.4 241 13 495 20 41.1 558.8
400 16 825 411.2 146.1 260 13 552 20 44.4 616
450 18 915 462.3 162 276 13 597 20 50.8 685.8
500 20 985 514.4 177.8 292 13 641 20 53.8 749.3
600 24 1170 616 203.2 330 13 762 20 66.55 901.7
Class 2500
DN 
NPS Overall Diameter  Inside Diameter(Min.) Thickness of Flange(Min.) Overall Lenght  Lap Radius Diameter of Hub Number of Bolts Diameter of Bolt Holes  Diameter of Bolt Circle 
　 　 A B C D R F H I J
15
 1/2 135 22.9 30.2 40 3 43 4 22.3 88.9
20  3/4 140 28.2 31.8 43 3 51 4 22.3 95.2
25 1 160 34.9 35 48 3 57 4 25.4 108
32 1 1/4 185 43.7 38.1 52 5 73 4 28.4 130.2
40 1 1/2 205 50 44.5 60 6 79 4 31.75 146
50 2 235 62.5 50.9 70 8 95 8 28.4 171.4
65 2 1/2 265 75.4 57.2 79 8 114 8 31.75 196.8
80 3 305 91.4 66.7 92 10 133 8 35.1 228.6
100 4 355 116.8 76.2 108 11 165 8 41.1 273
125 5 420 144.4 92.1 130 11 203 8 47.8 323.8
150 6 485 171.4 108 152 13 235 8 53.8 368.3
200 8 550 222.2 127 178 13 305 12 53.8 438.2
250 10 675 277.4 165.1 229 13 375 12 66.55 539.8
300 12 760 328.2 184.2 254 13 441 12 73.15 619.1

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