Welding Neck Flanges
Class 150
| Nominal size | O | C | R | X | A | Y | Number of holes | Diam. of holes | Diam. of bolts | Diam. of bolt circle | Weight | |
| in mm |
1/2″ | 3.50 88.9 | 0.44 11.2 | 1.38 35.1 | 1.19 30.2 | 0.84 21.3 | 1.88 47.8 | 4 | 0.62 15.7 | 1/2 12.7 | 2.38 60.5 | 2 1 |
| in mm |
3/4″ | 3.88 98.6 | 0.50 12.7 | 1.69 42.9 | 1.50 38.1 | 1.05 26.7 |
2.06 52.3 |
4 | 0.62 15.7 |
1/2 12.7 | 2.75 69.9 |
2 1 |
| in mm | 1″ | 4.25 108.0 | 0.56 14.2 | 2.00 50.8 | 1.94 49.3 | 1.32 33.5 |
2.19 55.6 |
4 | 0.62 15.7 |
1/2 12.7 | 3.12 79.2 | 3 1 |
| in mm | 1 1/4″ | 4.62 117.3 | 0.62 15.7 | 2.50 63.5 | 2.31 58.7 | 1.66 42.2 |
2.25 57.2 |
4 | 0.62 15.7 |
1/2 12.7 | 3.50 88.9 |
3 1 |
| in mm | 1 1/2″ | 5.00 127.0 | 0.69 17.5 | 2.88 73.2 | 2.56 65.0 | 1.90 48.3 |
2.44 62.0 |
4 | 0.62 15.7 |
1/2 12.7 | 3.88 98.6 | 4 2 |
| in mm | 2″ | 6.00 152.4 | 0.75 19.1 | 3.62 91.9 | 3.06 77.7 | 2.38 60.5 |
2.50 63.5 |
4 | 0.75 19.1 |
5/8 15.9 |
4.75 120.7 | 6 3 |
| in mm | 3″ | 7.50 190.5 | 0.94 23.9 | 5.00 127.0 | 4.25 108.0 | 3.50 88.9 |
2.75 69.9 |
4 | 0.75 19.1 |
5/8 15.9 | 6.00 152.4 |
10 5 |
| in mm | 3 1/2″ | 8.50 215.9 | 0.94 23.9 | 5.50 139.7 | 4.81 122.2 | 4.00 101.6 |
2.81 71.4 |
8 | 0.75 19.1 |
5/8 15.9 |
7.00 177.8 | 12 5 |
| in mm | 4″ | 9.00 228.6 | 0.94 23.9 | 6.19 157.2 | 5.31 134.9 | 4.50 114.3 |
3.00 76.2 | 8 | 0.03 0.76 |
7.50 190.5 | 3.12 79.25 |
15 7 |
| in mm | 5″ | 10.00 254.0 | 0.94 23.9 | 7.31 185.7 | 6.44 163.6 | 5.56 141.2 |
3.50 88.9 |
8 | 0.88 22.4 |
3/4 19.1 |
8.50 215.9 | 19 9 |
| in mm | 6″ | 11.00 279.4 | 1.00 25.4 | 8.50 215.9 | 7.56 192.0 | 6.63 168.4 |
3.50 88.9 |
8 | 0.88 22.4 |
3/4 19.1 | 9.50 241.3 |
24 11 |
| in mm | 8″ | 13.50 342.9 | 1.12 28.4 | 10.62 269.7 | 9.69 246.1 | 8.63 219.2 |
4.00 101.6 |
8 | 0.88 22.4 |
3/4 19.1 | 11.75 298.5 | 39 18 |
| in mm | 10″ | 16.00 406.4 | 1.19 30.2 | 12.75 323.9 | 12.00 304.8 | 10.75 273.1 |
4.00 101.6 |
12 | 1.00 25.4 |
7/8 22.2 |
14.25 362.0 | 52 24 |
| in mm | 12″ | 19.00 482.6 | 1.25 31.8 | 15.00 381.0 | 14.38 365.3 | 12.75 323.9 |
4.50 114.3 |
12 | 1.00 25.4 |
7/8 22.2 | 17.00 431.8 |
80 36 |
| in mm | 14″ | 21.00 533.4 | 1.38 35.1 | 16.25 412.8 | 15.75 400.1 | 14.00 355.6 |
5.00 127.0 |
12 | 1.12 28.4 |
1 25.4 |
18.75 476.3 | 110 50 |
| in mm | 16″ | 23.50 596.9 | 1.44 36.6 | 18.50 469.9 | 18.00 457.2 | 16.00 406.4 |
5.00 127.0 |
16 | 1.12 28.4 |
1 25.4 |
21.25 539.8 | 140 64 |
| in mm | 18″ | 25.00 635.0 | 1.56 39.6 | 21.00 533.4 | 19.88 505.0 | 18.00 457.2 |
5.50 139.7 |
16 | 1.25 31.8 |
1 1/8 28.6 | 22.75 577.9 |
150 68 |
| in mm | 20″ | 27.50 698.5 | 1.69 42.9 | 23.00 584.2 | 22.00 558.8 | 20.00 508.0 |
5.69 144.5 |
20 | 1.25 31.8 |
1 1/8 28.6 | 25.00 635.0 | 180 82 |
| in mm | 24″ | 32.00 812.8 | 1.88 47.8 | 27.25 692.2 | 26.12 663.4 | 24.00 609.6 |
6.00 152.4 |
20 | 1.38 35.1 |
1 1/4 31.8 | 29.50 749.3 | 260 118 |