ADOPTED_FROM:EN 4561:2003 This standard specifies the characteristics of welded elbows 90° for inch series pipe couplings, in heat resisting steel, for aerospace applications. Nominal pressure: Class D per ISO 6771
NS-EN 4561:2003 history
2003NS-EN 4561:2003 Aerospace series — Pipe coupling, welded, in heat resisting steel — Elbow 90° — Inch series