Welding Neck Flanges
DIN
| Standard | PN | DN |
| 2631 | 6 | ab 10 |
| 2632 | 10 | ab 200 |
| 2633 | 16 | ab 10 |
| 2634 | 25 | ab 200 |
| 2635 | 40 | ab 10 |
| 2636 | 64 | ab 50 |
| 2637 | 100 | ab 10 |
| 2638 | 160 | ab 10 |
ASME (ANSI B16.5)
| Class | NPS |
| 150lbs | ab 1/2" |
| 300lbs | ab 1/2" |
| 400lbs | ab 4" |
| 600lbs | ab 1/2" |
| 900lbs | ab 3" |
| 1500lbs | ab 1/2" |
| 2500lbs | ab 1/2" |
EN 1092-1 Typ 11
| PN | DN |
| 2,5 | ab 1200 |
| 6 | ab 10 |
| 10 | ab 200 |
| 16 | ab 50 |
| 25 | ab 200 |
| 40 | ab 10 |
| 63 | ab 50 |
| 100 | ab 10 |
