ASME/ANSI B16.5 Class 150 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 90 34.9 9.6 30 21.3 46 15.8 60.3 15.9 4 0.51
3/4 100 42.9 11.2 38 26.7 51 20.9 69.9 15.9 4 0.76
1 110 50.8 12.7 49 33.4 54 26.6 79.4 15.9 4 1.09
1 1/4 115 63.5 14.3 59 42.2 56 35.1 88.9 15.9 4 1.35
1 1/2 125 73.0 15.9 65 48.3 60 40.9 98.4 15.9 4 1.73
2 150 92.1 17.5 78 60.3 62 52.5 120.7 19.1 4 2.60
2 1/2 180 104.8 20.7 90 70.0 68 62.7 139.7 19.1 4 4.26
3 190 127.0 22.3 108 88.9 68 77.9 152.4 19.1 4 5.08
3 1/2 215 139.7 22.3 122 101.6 70 90.1 177.8 19.1 8 6.27
4 230 157.2 22.3 135 114.3 75 102.3 190.5 19.1 8 7.26
5 255 185.7 22.3 164 141.3 87 128.2 215.9 22.2 8 9.11
6 280 215.9 23.9 192 168.3 87 154.1 241.3 22.2 8 11.15
8 345 269.9 27.0 246 219.1 100 202.7 298.5 22.2 8 18.57
10 405 323.8 28.6 305 273.0 100 254.6 362.0 25.4 12 24.87
12 485 381.0 30.2 365 323.8 113 304.8 431.8 25.4 12 38.86
14 535 412.8 33.4 400 355.6 125 336.5 476.3 28.6 12 50.99
16 595 469.9 35.0 457 406.4 125 387.3 539.8 28.6 16 62.28
18 635 533.4 38.1 505 457.0 138 437.9 577.9 31.8 16 71.45
20 700 584.2 41.3 559 508.0 143 488.9 635.0 31.8 20 88.66
24 815 692.2 46.1 663 610.0 151 590.9 749.3 34.9 20 120.46


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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