ASME/ANSI B16.5 Class 900 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 Approxi-mate Weight kgs
NPS O R tf X Y B W I n  
1/2 120 34.9 22.3 38 32 22.2 82.6 22.2 4 1.73
3/4 130 42.9 25.4 44 35 27.7 88.9 22.2 4 2.33
1 150 50.8 28.6 52 41 34.5 101.6 25.4 4 3.48
1 1/4 160 63.5 28.6 64 41 43.2 111.1 25.4 4 4.00
1 1/2 180 73.0 31.8 70 44 49.5 123.8 28.6 4 5.54
2 215 92.1 38.1 105 57 61.9 165.1 25.4 8 9.79
2 1/2 245 104.8 41.3 124 64 74.6 190.5 28.6 8 13.82
3 240 127.0 38.1 127 54 90.7 190.5 25.4 8 11.51
4 290 157.2 44.5 159 70 116.1 235.0 31.8 8 19.52
5 350 185.7 50.8 190 79 143.8 279.4 34.9 8 32.14
6 380 215.9 55.6 235 86 170.7 317.5 31.8 12 41.04
8 470 269.9 63.5 298 102 221.5 393.7 38.1 12 70.97
10 545 323.8 69.9 368 108 276.2 469.9 38.1 16 100.32
12 610 381.0 79.4 419 117 327.0 533.4 38.1 20 133.26
14 640 412.8 85.8 451 130 359.2 558.8 41.3 20 152.57
16 705 469.9 88.9 508 133 410.5 616.0 44.5 20 185.15
18 785 533.4 101.6 565 152 461.8 685.8 50.8 20 256.28
20 855 584.2 108.0 622 159 513.1 749.3 54.0 20 315.13
24 1040 692.2 139.7 749 203 616.0 901.7 66.7 20 603.79

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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