ASME/ANSI B16.5 Class 2500 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  
1/2 135 34.9 30.2 43 21.3 73 15.8 88.9 22.2 4 3.23
3/4 140 42.9 31.8 51 26.7 79 21.0 95.2 22.2 4 3.74
1 160 50.8 35.0 57 33.4 89 26.6 108.0 25.4 4 5.34
1 1/4 185 63.5 38.1 73 42.2 95 35.1 130.2 28.6 4 7.84
1 1/2 205 73.0 44.5 79 48.3 111 40.9 146.0 31.8 4 11.10
2 235 92.1 50.9 95 60.3 127 52.5 171.4 28.6 8 16.21
2 1/2 265 104.8 57.2 114 73.0 143 62.7 196.8 31.8 8 23.40
3 305 127.0 66.7 133 88.9 168 77.9 228.6 34.9 8 36.10
4 355 157.2 76.2 165 114.3 190 102.3 273.0 41.3 8 54.89
5 420 185.7 92.1 203 141.3 229 128.2 323.8 47.6 8 92.52
6 485 215.9 108.0 235 168.3 273 154.1 368.3 54.0 8 143.61
8 550 269.9 127.0 305 219.1 318 202.7 438.2 54.0 12 211.29
10 675 323.8 165.1 375 273.0 419 254.5 539.8 66.7 12 408.58
12 760 381.0 184.2 441 323.8 464 304.7 619.1 73.0 12 572.56


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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