ASME/ANSI B16.5 Class 600 LJ

Nominal Pipe Size  Outside Diameter of Flange Thickness of Lap Joint Min. Diameter of Hub Length Through Hub Bore Corner Radius of Bore of Lapped Flange Diameter of Bolt Circle Diameter of Bolt Holes Number of Bolts Approxi-mate Weight kgs
NPS O tf X Y B r W I n  
1/2 95 14.3 38 22 22.9 3 66.7 15.9 4 0.70
3/4 115 15.9 48 25 28.2 3 82.6 19.1 4 1.16
1 125 17.5 54 27 34.9 3 88.9 19.1 4 1.50
1 1/4 135 20.7 64 29 43.7 5 98.4 19.1 4 2.01
1 1/2 155 22.3 70 32 50.0 6 114.3 22.2 4 2.83
2 165 25.4 84 37 62.5 8 127.0 19.1 8 3.42
2 1/2 190 28.6 100 41 75.4 8 149.2 22.2 8 5.00
3 210 31.8 117 46 91.4 10 168.3 22.2 8 6.71
3 1/2 230 35.0 133 49 104.1 10 184.2 25.4 8 8.56
4 275 38.1 152 54 116.8 11 215.9 25.4 8 14.29
5 330 44.5 189 60 144.4 11 266.7 28.6 8 23.80
6 355 47.7 222 67 171.4 13 292.1 28.6 12 27.93
8 420 55.6 273 76 222.2 13 349.2 31.8 12 42.59
10 510 63.5 343 111 277.4 13 431.8 34.9 16 76.04
12 560 66.7 400 117 328.2 13 489.0 34.9 20 90.92
14 605 69.9 432 127 360.2 13 527.0 38.1 20 109.42
16 685 76.2 495 140 411.2 13 603.2 41.3 20 154.99
18 745 82.6 546 152 462.3 13 654.0 44.5 20 189.94
20 815 88.9 610 165 514.4 13 723.9 44.5 24 243.66
24 940 101.6 718 184 616.0 13 838.2 50.8 24 346.39


Standards, Dimensions & Weight of SW Flanges

The Socket Welding Flange is attached to the pipe by a fillet weld around the hub of the flange.

This is eliminates any restriction in flow when using a socket welding flange.

Details of Lap Joint Flange


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