Welding Neck Flanges
Class 1500
| 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″ | 4.75 | 0.88 | 1.38 | 1.5 | 0.84 | 2.38 | 4 | 0.88 | 3/4″ | 3.25 | 5 |
| mm. | 120.7 | 22.4 | 35.1 | 38.1 | 21.3 | 60.5 | 22.4 | 19.1 | 82.6 | 2 | ||
| in. | 3/4″ | 5.12 | 1 | 1.69 | 1.75 | 1.05 | 2.75 | 4 | 0.88 | 3/4″ | 3.5 | 6 |
| mm. | 130 | 25.4 | 42.9 | 44.5 | 26.7 | 69.9 | 22.4 | 19.1 | 88.9 | 3 | ||
| in. | 1″ | 5.88 | 1.12 | 2 | 2.06 | 1.32 | 2.88 | 4 | 1 | 7/8″ | 4 | 9 |
| mm. | 149.4 | 28.4 | 50.8 | 52.3 | 33.5 | 73.2 | 25.4 | 22.2 | 101.6 | 4 | ||
| in. | 1 1/4″ | 6.25 | 1.12 | 2.5 | 2.5 | 1.66 | 2.88 | 4 | 1 | 7/8″ | 4.38 | 10 |
| mm. | 158.8 | 28.4 | 63.5 | 63.5 | 42.2 | 73.2 | 25.4 | 22.2 | 111.3 | 5 | ||
| in. | 1 1/2″ | 7 | 1.25 | 2.88 | 2.75 | 1.9 | 3.25 | 4 | 1.12 | 1″ | 4.88 | 13 |
| mm. | 177.8 | 31.8 | 73.2 | 69.9 | 48.3 | 82.6 | 28.4 | 25.4 | 124 | 6 | ||
| in. | 2″ | 8.5 | 1.5 | 3.62 | 4.12 | 2.38 | 4 | 8 | 1 | 7/8″ | 6.5 | 25 |
| mm. | 215.9 | 38.1 | 91.9 | 104.6 | 60.5 | 101.6 | 25.4 | 22.2 | 165.1 | 11 | ||
| in. | 2 1/2″ | 9.62 | 1.62 | 4.12 | 4.88 | 2.88 | 4.12 | 8 | 1.12 | 1″ | 7.5 | 36 |
| mm. | 244.3 | 41.1 | 104.6 | 124 | 73.2 | 104.6 | 28.4 | 25.4 | 190.5 | 16 | ||
| in. | 3″ | 10.5 | 1.88 | 5 | 5.25 | 3.5 | 4.62 | 8 | 1.25 | 1 1/8″ | 8 | 48 |
| mm. | 266.7 | 47.8 | 127 | 133.4 | 88.9 | 117.3 | 31.8 | 28.6 | 203.2 | 22 | ||
| in. | 4″ | 12.25 | 2.12 | 6.19 | 6.38 | 4.5 | 4.88 | 8 | 1.38 | 1 1/4″ | 9.5 | 73 |
| mm. | 311.2 | 53.8 | 157.2 | 162.1 | 114.3 | 124 | 35.1 | 31.8 | 241.3 | 33 | ||
| in. | 5″ | 14.75 | 2.88 | 7.31 | 7.75 | 5.56 | 6.12 | 8 | 1.62 | 1 1/2″ | 11.5 | 130 |
| mm. | 374.7 | 73.2 | 185.7 | 196.9 | 141.2 | 155.4 | 41.1 | 38.1 | 292.1 | 59 | ||
| in. | 6″ | 15.5 | 3.25 | 8.5 | 9 | 6.63 | 6.75 | 12 | 1.5 | 1 3/8″ | 12.5 | 165 |
| mm. | 393.7 | 82.6 | 215.9 | 228.6 | 168.4 | 171.5 | 38.1 | 34.9 | 317.5 | 75 | ||
| in. | 8″ | 19 | 3.62 | 10.62 | 11.5 | 8.63 | 8.38 | 12 | 1.75 | 1 5/8″ | 15.5 | 275 |
| mm. | 482.6 | 91.9 | 269.7 | 292.1 | 219.2 | 212.9 | 44.5 | 41.3 | 393.7 | 125 | ||
| in. | 10″ | 23 | 4.25 | 12.75 | 14.5 | 10.75 | 10 | 12 | 2 | 1 7/8″ | 19 | 455 |
| mm. | 584.2 | 108 | 323.9 | 368.3 | 273.1 | 254 | 50.8 | 47.6 | 482.6 | 206 | ||
| in. | 12″ | 26.5 | 4.88 | 15 | 17.75 | 12.75 | 11.12 | 16 | 2.12 | 2″ | 22.5 | 690 |
| mm. | 673.1 | 124 | 381 | 450.9 | 323.9 | 282.4 | 53.8 | 50.8 | 571.5 | 313 | ||
| in. | 14″ | 29.5 | 5.25 | 16.25 | 19.5 | 14 | 11.75 | 16 | 2.38 | 2 1/4″ | 25 | 940 |
| mm. | 749.3 | 133.4 | 412.8 | 495.3 | 355.6 | 298.5 | 60.5 | 57.2 | 635 | 426 | ||
| in. | 16″ | 32.5 | 5.75 | 18.5 | 21.75 | 16 | 12.25 | 16 | 2.62 | 2 1/2″ | 27.75 | 1250 |
| mm. | 825.5 | 146.1 | 469.9 | 552.5 | 406.4 | 311.2 | 66.5 | 63.5 | 704.9 | 567 | ||
| in. | 18″ | 36 | 6.38 | 21 | 23.5 | 18 | 12.88 | 16 | 2.88 | 2 3/4″ | 30.5 | 1625 |
| mm. | 914.4 | 162.1 | 533.4 | 596.9 | 457.2 | 327.2 | 73.2 | 69.9 | 774.7 | 737 | ||
| in. | 20″ | 38.75 | 7 | 23 | 25.25 | 20 | 14 | 16 | 3.12 | 3″ | 32.75 | 2050 |
| mm. | 984.3 | 177.8 | 584.2 | 641.4 | 508 | 355.6 | 79.2 | 76.2 | 831.9 | 930 | ||
| in. | 24″ | 46 | 8 | 27.25 | 30 | 24 | 16 | 16 | 3.62 | 3 1/2″ | 39 | 3325 |
| mm. | 1168.4 | 203.2 | 692.2 | 762 | 609.6 | 406.4 | 91.9 | 88.9 | 990.6 | 1508 |