Click image to view full size image
The ASME B16. 5 Weld Neck Flange is produced with a long tapered hub, which transitions gradually over to the wall thickness from a pipe or fitting. The long tapered hub present on the ASME B16. 5 Carbon Steel Weld Neck Flange is what provides an important reinforcement to this component.
http://www.longmenforging.com/