DS EN 4553:2003
DS EN 4553:2003 Aerospace Series - Pipe Coupling, 37 Degrees, Spherical, In Heat Resisting Steel - Elbow 90 Degrees Nipples, Welded End - Inch Series Defines the characteristics of welded elbow 90 degrees nipples for inch series pipe couplings, 37 degrees, spherical, in heat resisting steel, for aerospace applications.