| Nominal Pipe Size (NPS) | DN | Center-to-Center O | Outside Diameter at Bevel | Back-to-Face K |
|---|---|---|---|---|
| 1 | 25 | 51 | 33.4 | 41 |
| 1-1/4 | 32 | 64 | 42.2 | 52 |
| 1-1/2 | 404 | 76 | 8.3 | 62 |
| 2 | 50 | 102 | 60.3 | 81 |
| 2-1/2 | 65 | 127 | 73.0 | 100 |
| 3 | 80 | 152 | 88.9 | 121 |
| 3-1/2 | 90 | 178 | 101.6 | 140 |
| 4 | 100 | 203 | 114.3 | 159 |
| 5 | 125 | 254 | 141.3 | 197 |
| 6 | 150 | 305 | 168.3 | 237 |
| 8 | 200 | 406 | 219.1 | 313 |
| 10 | 250 | 508 | 273.0 | 391 |
| 12 | 300 | 610 | 323.8 | 467 |
| 14 | 350 | 711 | 355.6 | 533 |
| 16 | 400 | 813 | 406.4 | 610 |
| 18 | 450 | 914 | 457 | 686 |
| 20 | 500 | 1016 | 508 | 762 |
| 22 | 550 | 1118 | 559 | 838 |
| 24 | 600 | 1219 | 610 | 914 |
BUTTWELD FITTINGS