Welding Neck Flanges
Class 600
| Nominal size | O | C | R | X | A | Y | No. of holes | Diam. of holes | Diam. of bolts | Diam. of bolt circle | Approx. weight pounds Kg | |
| O | C | R | X | A | Y | |||||||
| in. | 1/2″ | 3.75 | 0.56 | 1.38 | 1.5 | 0.84 | 2.06 | 4 | 0.62 | 1/2″ | 2.62 | 2 |
| mm. | 95.3 | 14.2 | 35.1 | 38.1 | 21.3 | 52.3 | 15.7 | 12.7 | 66.5 | 1 | ||
| in. | 3/4″ | 4.62 | 0.62 | 1.69 | 1.88 | 1.05 | 2.25 | 4 | 0.75 | 5/8″ | 3.25 | 4 |
| mm. | 117.3 | 15.7 | 42.9 | 47.8 | 26.7 | 57.2 | 19.1 | 15.9 | 82.6 | 2 | ||
| in. | 1″ | 4.88 | 0.69 | 2 | 2.12 | 1.32 | 2.44 | 4 | 0.75 | 5/8″ | 3.5 | 4 |
| mm. | 124 | 17.5 | 50.8 | 53.8 | 33.5 | 62 | 19.1 | 15.9 | 88.9 | 2 | ||
| in. | 1 1/4″ | 5.25 | 0.81 | 2.5 | 2.5 | 1.66 | 2.62 | 4 | 0.75 | 5/8″ | 3.88 | 6 |
| mm. | 133.4 | 20.6 | 63.5 | 63.5 | 42.2 | 66.5 | 19.1 | 15.9 | 98.6 | 3 | ||
| in. | 1 1/2″ | 6.12 | 0.88 | 2.88 | 2.75 | 1.9 | 2.75 | 4 | 0.88 | 3/4″ | 4.5 | 8 |
| mm. | 155.4 | 22.4 | 73.2 | 69.9 | 48.3 | 69.9 | 22.4 | 19.1 | 114.3 | 4 | ||
| in. | 2″ | 6.5 | 1 | 3.62 | 3.31 | 2.38 | 2.88 | 8 | 0.75 | 5/8″ | 5 | 12 |
| mm. | 165.1 | 25.4 | 91.9 | 84.1 | 60.5 | 73.2 | 19.1 | 15.9 | 127 | 5 | ||
| in. | 2 1/2″ | 7.5 | 1.12 | 4.12 | 3.94 | 2.88 | 3.12 | 8 | 0.88 | 3/4″ | 5.88 | 18 |
| mm. | 190.5 | 28.4 | 104.6 | 100.1 | 73.2 | 79.2 | 22.4 | 19.1 | 149.4 | 8 | ||
| in. | 3″ | 8.25 | 1.25 | 5 | 4.62 | 3.5 | 3.25 | 8 | 0.88 | 3/4″ | 6.62 | 23 |
| mm. | 209.6 | 31.8 | 127 | 117.3 | 88.9 | 82.6 | 22.4 | 19.1 | 168.1 | 10 | ||
| in. | 3 1/2″ | 9 | 1.38 | 5.5 | 5.25 | 4 | 3.38 | 8 | 1 | 7/8″ | 7.25 | 26 |
| mm. | 228.6 | 35.1 | 139.7 | 133.4 | 101.6 | 85.9 | 25.4 | 22.2 | 184.2 | 12 | ||
| in. | 4″ | 10.75 | 1.5 | 6.19 | 6 | 4.5 | 4 | 8 | 1 | 7/8″ | 8.5 | 42 |
| mm. | 273.1 | 38.1 | 157.2 | 152.4 | 114.3 | 101.6 | 25.4 | 22.2 | 215.9 | 19 | ||
| in. | 5″ | 13 | 1.75 | 7.31 | 7.44 | 5.56 | 4.5 | 8 | 1.12 | 1″ | 10.5 | 68 |
| mm. | 330.2 | 44.5 | 185.7 | 189 | 141.2 | 114.3 | 28.4 | 25.4 | 266.7 | 31 | ||
| in. | 6″ | 14 | 1.88 | 8.5 | 8.75 | 6.63 | 4.62 | 12 | 1.12 | 1″ | 11.5 | 81 |
| mm. | 355.6 | 47.8 | 215.9 | 222.3 | 168.4 | 117.3 | 28.4 | 25.4 | 292.1 | 37 | ||
| in. | 8″ | 16.5 | 2.19 | 10.62 | 10.75 | 8.63 | 5.25 | 12 | 1.25 | 1 1/8″ | 13.75 | 120 |
| mm. | 419.1 | 55.6 | 269.7 | 273.1 | 219.2 | 133.4 | 31.8 | 28.6 | 349.3 | 54 | ||
| in. | 10″ | 20 | 2.5 | 12.75 | 13.5 | 10.75 | 6 | 16 | 1.38 | 1 1/4″ | 17 | 190 |
| mm. | 508 | 63.5 | 323.9 | 342.9 | 273.1 | 152.4 | 35.1 | 31.8 | 431.8 | 86 | ||
| in. | 12″ | 22 | 2.62 | 15 | 15.75 | 12.75 | 6.12 | 20 | 1.38 | 1 1/4″ | 19.25 | 225 |
| mm. | 558.8 | 66.5 | 381 | 400.1 | 323.9 | 155.4 | 35.1 | 31.8 | 489 | 102 | ||
| in. | 14″ | 23.75 | 2.75 | 16.25 | 17 | 14 | 6.5 | 20 | 1.5 | 1 3/8″ | 20.75 | 280 |
| mm. | 603.3 | 69.9 | 412.8 | 431.8 | 355.6 | 165.1 | 38.1 | 34.9 | 527.1 | 127 | ||
| in. | 16″ | 27 | 3 | 18.5 | 19.5 | 16 | 7 | 20 | 1.62 | 1 1/2″ | 23.75 | 390 |
| mm. | 685.8 | 76.2 | 469.9 | 495.3 | 406.4 | 177.8 | 41.1 | 38.1 | 603.3 | 177 | ||
| in. | 18″ | 29.25 | 3.25 | 21 | 21.5 | 18 | 7.25 | 20 | 1.75 | 1 5/8″ | 25.75 | 475 |
| mm. | 743 | 82.6 | 533.4 | 546.1 | 457.2 | 184.2 | 44.5 | 41.3 | 654.1 | 215 | ||
| in. | 20″ | 32 | 3.5 | 23 | 24 | 20 | 7.5 | 24 | 1.75 | 1 5/8″ | 28.5 | 590 |
| mm. | 812.8 | 88.9 | 584.2 | 609.6 | 508 | 190.5 | 44.5 | 41.3 | 723.9 | 268 | ||
| in. | 24″ | 37 | 4 | 27.25 | 28.25 | 24 | 8 | 24 | 2 | 1 7/8″ | 33 | 830 |
| mm. | 939.8 | 101.6 | 692.2 | 717.6 | 609.6 | 203.2 | 50.8 | 47.6 | 838.2 | 376 |