ASME/ANSI B16.5 Class 300 WN

Nominal Pipe Size  Outside Diameter of Flange Diameter of Raised Face Thickness of Flanges Min. Diameter of Hub Hub Diameter Beginning of Chamfer Length Through Hub Bore Diameter of Bolt Circle Diameter of Bolt Holes Number of Bolts Approxi-mate Weight kgs
NPS O R tf X A Y B W I n  
1/2 95 34.9 12.7 38 21.3 51 15.8 66.7 15.9 4 0.77
3/4 115 42.9 14.3 48 26.7 56 20.9 82.6 19.1 4 1.26
1 125 50.8 15.9 54 33.4 60 26.6 88.9 19.1 4 1.67
1 1/4 135 63.5 17.5 64 42.2 64 35.1 98.4 19.1 4 2.17
1 1/2 155 73.0 19.1 70 48.3 67 40.9 114.3 22.2 4 2.99
2 165 92.1 20.7 84 60.3 68 52.5 127.0 19.1 8 3.54
2 1/2 190 104.8 23.9 100 73.0 75 62.7 149.2 22.2 8 5.37
3 210 127.0 27.0 117 88.9 78 77.9 168.3 22.2 8 7.23
3 1/2 230 139.7 28.6 133 101.6 79 90.1 184.2 22.2 8 9.10
4 255 157.2 30.2 146 114.3 84 102.3 200.0 22.2 8 11.75
5 280 185.7 33.4 178 141.3 97 128.2 235.0 22.2 8 15.73
6 320 215.9 35.0 206 168.3 97 154.1 269.9 22.2 12 20.30
8 380 269.9 39.7 260 219.1 110 202.7 330.2 25.4 12 30.87
10 445 323.8 46.1 321 273.0 116 254.6 387.4 28.6 16 44.75
12 520 381.0 49.3 375 323.8 129 304.8 450.8 31.8 16 64.08
14 585 412.8 52.4 425 355.6 141 336.5 514.4 31.8 20 89.57
16 650 469.9 55.6 483 406.4 144 387.3 571.5 34.9 20 112.01
18 710 533.4 58.8 533 457.0 157 437.9 628.6 34.9 24 136.08
20 775 584.2 62.0 587 508.0 160 488.9 685.8 34.9 24 165.07
24 915 692.2 68.3 702 610.0 167 590.9 812.8 41.3 24 239.43


Standards, Dimensions & Weight of WN flange

The welding neck flange is the best designed butt-welded flange of those currently available becuase of its inherent structural value.

Most common flange types

Regardless of custom sizing or specifications, the fundamental design of most flanges falls under six common styles created to close, connect, cover, or support pipes and pipe systems.



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