ASME/ANSI B16.5 Class 600 SO

Nominal Pipe Size  Outside Diameter of Flange Diameter of Raised Face Thickness of Flanges Min. Diameter of Hub Length Through Hub Bore Diameter of Bolt Circle Diameter of Bolt Holes Number of Bolts Approximate Weight kgs
NPS O R tf X Y B W I n  
1/2 95 34.9 14.3 38 22 22.2 66.7 15.9 4 0.74
3/4 115 42.9 15.9 48 25 27.7 82.6 19.1 4 1.21
1 125 50.8 17.5 54 27 34.5 88.9 19.1 4 1.56
1 1/4 135 63.5 20.7 64 29 43.2 98.4 19.1 4 2.11
1 1/2 155 73.0 22.3 70 32 49.5 114.3 22.2 4 2.97
2 165 92.1 25.4 84 37 61.9 127.0 19.1 8 3.64
2 1/2 190 104.8 28.6 100 41 74.6 149.2 22.2 8 5.26
3 210 127.0 31.8 117 46 90.7 168.3 22.2 8 7.08
3 1/2 230 139.7 35.0 133 49 103.4 184.2 25.4 8 8.99
4 275 157.2 38.1 152 54 116.1 215.9 25.4 8 14.83
5 330 185.7 44.5 189 60 143.8 266.7 28.6 8 24.46
6 355 215.9 47.7 222 67 170.7 292.1 28.6 12 28.78
8 420 269.9 55.6 273 76 221.5 349.2 31.8 12 43.77
10 510 323.8 63.5 343 86 276.2 431.8 34.9 16 71.35
12 560 381.0 66.7 400 92 327.0 489.0 34.9 20 84.95
14 605 412.8 69.9 432 94 359.2 527.0 38.1 20 100.05
16 685 469.9 76.2 495 106 410.5 603.2 41.3 20 141.69
18 745 533.4 82.6 546 117 461.8 654.0 44.5 20 175.13
20 815 584.2 88.9 610 127 513.1 723.9 44.5 24 222.87
24 940 692.2 101.6 718 140 616.0 838.2 50.8 24 313.75

Note: 7 mm raised face regularly furnished on Classes 150 and 300 unless otherwise ordered.



Standards, Dimensions & Weight of Slip on flanges

The Slip-on flange has a low hub because the pipe slips into the flange prior to welding.

Details of Slip On flange
1. Slip On flange 2. Filled weld outside 3. Filled weld inside 4. Pipe

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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